This post may or may not be updated regularly. For more up-to-date information on capping you can follow along on my Google Sheet.
Currently on LIVE version NW.110.20190411b.38
So how will scaling work? Not like scaling should work. To be more precise, it is capping. When going to certain areas or even moving within some areas you will be capped. This is done as an item level cap.
Things that are capped:
Gear Cap: All of your character's gear, your companion's gear, and even your Artifacts will be capped to this level.
Enchantment Cap: Single-stat, Double-stat, Triple-stat, Armor, and Weapon enchantments will be capped to this level.
Runestone Cap: Normal runestones will be capped to this level.
Bonding Runestone Cap: Bonding Runestones will be capped to this level.
Companion Player Bonus Cap: CPBs will be capped to this level.
Mount Bonus Cap: Mount Equip Power will be capped to this level.
I do not have a legendary mount at this time, so anywhere I am unsure of the cap you will see "???"
Insignia Cap: Mount Insignia will be capped to this level.
Campaign Boon Cap: Campaign boons are handled individually and will be capped to this level.
Stronghold Boon Cap: Stronghold boons are actually percentage scaled.
The following areas are not capped
Barovia, Blackdagger Ruins, Blacklake District, Catacombs (Undermountain)*, The Chasm, Ebon Downs*, Helm's Hold, Icespire Peak*, Mount Hotenow, Neverdeath Graveyard*, Pirate's Skyhold, Protector's Enclave, Rothe Valley*, Spinward Rise, Terminus (Undermountain)*, Tower District, Twisted Caverns (Undermountain)*, Vellosk, Whispering Caverns*, Wyllowwood (Undermountain)*, Yawning Portal
*There are areas inside these areas where you will be capped. Those areas are listed below.
The following areas are capped
Castle Ravenloft, Cradle of the Death God
Character Level: 70
Assault on Svardborg (master), Tomb of the Nine Gods
Character Level: 70
Gear: 855
Enchantment: 29
Runestone: 14
Bonding: 300
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 32
Campaign Boons: 60 per boon
Stronghold Boons: 100% no bonus
Demogorgon (master), Lost City of Omu, Port Nyanzaru, Runic Corruption (Undermountain Heroics), Soshenstar River, Spellplague Caverns (master), Undercity (Lost City of Omu)
Character Level: 80
Gear: 805
Enchantment: 27
Runestone: 13
Bonding: 280
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 29
Campaign Boons: 60 per boon
Stronghold Boons: 100%
Assault on Svardborg, Attack on Caer-Konig, Biggrin's Tomb, Blackdagger Coast (Acquisitions Inc.), Castle Never, Chult Patrols, Cragmire Crypts (master), Demogorgon, Dread Ring, Dwarven Valley, Fane of the Night Serpent, Fangbreaker Island, Gray Wolf Den (master), House of the Crocodile, Icewind Pass, Kessel's Retreat, Lair of Lostmauth, Malabog's Castle, Manycoins Bank Heist, Portal to Tuern, River District, The Shores of Tuern, Temple of the Spider (master), Valindra's Tower, Well of Dragons
Character Level: 70
Gear: 728
Enchantment: 25
Runestone: 12
Bonding: 260
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 25
Campaign Boons: 60 per boon
Stronghold Boons: 100% no bonus
Bryn Shander, Cold Run, The Merchant Prince's Folly, Sea of Moving Ice
Character Level: 70
Gear: 644
Enchantment: 23
Runestone: 11
Bonding: 240
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 22
Campaign Boons: 60 per boon
Stronghold Boons: 100% no bonus
The Fiery Pit, Realm of Malabog (Sharandar)
Character Level: 68
Gear: 644
Enchantment: 23
Runestone: 11
Bonding: 240
Companion Player Bonus: 100
Mount Equip Bonus: 96
Insignia: 22
Campaign Boons: 60 per boon
Stronghold Boons: 97.14% no bonus
Caer-Konig, Dwarven Valley - Demonic Heroics, Icewind Pass - Demonic Heroics, Illusionist's Gambit (master)
Character Level: 70
Gear: 574
Enchantment: 21
Runestone: 10
Bonding: 240
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 21
Campaign Boons: 58 per boon
Stronghold Boons: 100% no bonus
Dark Fey Enclave (Sharandar), Reclamation Rock
Character Level: 66
Gear: 574
Enchantment: 21
Runestone: 10
Bonding: 240
Companion Player Bonus: 100
Mount Equip Bonus: 92
Insignia: 21
Campaign Boons: 58 per boon
Stronghold Boons: 94.28% no bonus
Lost City of Omu (Acquisition Inc.)
Character Level: 65
Gear: 556
Enchantment: 20
Runestone: 10
Bonding: 230
Companion Player Bonus: 100
Mount Equip Bonus: 90
Insignia: 21
Campaign Boons: 57 per boon
Stronghold Boons: 92.86% no bonus
Arcane Reservoir, Blighted Grove (Sharandar), Drowned Shore, Master of the Hunt, Sharandar
Character Level: 64
Gear: 546
Enchantment: 19
Runestone: 9
Bonding: 220
Companion Player Bonus: 100
Mount Equip Bonus: 92
Insignia: 21
Campaign Boons: 56 per boon
Stronghold Boons: 91.42% no bonus
The Searing Reach (Whispering Caverns)
Character Level: 60
Gear: 490
Enchantment: 15
Runestone: 7
Bonding: 210
Companion Player Bonus: 100
Mount Equip Bonus: 80
Insignia: 20
Campaign Boons: 52 per boon
Stronghold Boons: 85.72% no bonus
Dread Ring - Demonic Heroics, Mantol-Derith, Prophecy of Madness, Throne of the Dwarven Gods
Character Level: 70
Gear: 462
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 20
Campaign Boons: 50 per boon
Stronghold Boons: 100% no bonus
Dread Legion
Character Level: 70
Gear: 380
Enchantment: 13
Runestone: 7
Bonding: 210
Companion Player Bonus: 100
Mount Equip Bonus: 100
Insignia: 20
Campaign Boons: 50 per boon
Stronghold Boons: 100% no bonus
Pirate's Skyhold (Acquisitions Inc.), Venfithar (Rothe Valley)
Character Level: 55
Gear: 329
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 70
Insignia: 20
Campaign Boons: 50 per boon
Stronghold Boons: 78.58% no bonus
Caverns of Karrundax
Character Level: 54
Gear: 323
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 68
Insignia: 20
Campaign Boons: 50 per boon
Stronghold Boons: 77.14% no bonus
Miner's Vale (Icespire Peak)
Character Level: 49
Gear: 294
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 58
Insignia: 20
Campaign Boons: 50 per boon
Stronghold Boons: 70% no bonus
Temple of the Spider
Character Level: 50
Gear: 290
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 60
Insignia: 20
Campaign Boons: 30 per boon
Stronghold Boons: 71.42% no bonus
Spellplague Caverns
Character Level: 47
Gear: 283
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 54
Insignia: 20
Campaign Boons: 50 per boon
Stronghold Boons: 67.14% no bonus
Mantol-Derith - Beholder Convention
Character Level: 45
Gear: 272
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 50
Insignia: 20
Campaign Boons: 46 per boon
Stronghold Boons: 64.29% no bonus
The Frozen Heart
Character Level: 44
Gear: 266
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 48
Insignia: 20
Campaign Boons: 44 per boon
Stronghold Boons: 62.86% no bonus
Pirate King's Retreat
Character Level: 40
Gear: 244
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 40
Insignia: 20
Campaign Boons: 36 per boon
Stronghold Boons: 57.14% no bonus
Valley of the Ancients (Ebon Downs)
Character Level: 38
Gear: 231
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 36
Insignia: 20
Campaign Boons: 32 per boon
Stronghold Boons: 54.28% no bonus
Gray Wolf Den
Character Level: 36
Gear: 220
Enchantment: 12
Runestone: 6
Bonding: 200
Companion Player Bonus: 100
Mount Equip Bonus: 32
Insignia: 20
Campaign Boons: 30 per boon
Stronghold Boons: 51.42% no bonus
Icespire Peak (Acquisitions Inc.)
Character Level: 35
Gear: 214
Enchantment: 12
Runestone: 6
Bonding: 190
Companion Player Bonus: 100
Mount Equip Bonus: 30
Insignia: 20
Campaign Boons: 30 per boon
Stronghold Boons: 50% no bonus
Merchant's Landing (Neverdeath Graveyard)
Character Level: 30
Gear: 185
Enchantment: 11
Runestone: 5
Bonding: 140
Companion Player Bonus: 100
Mount Equip Bonus: 20
Insignia: 20
Campaign Boons: 24 per boon
Stronghold Boons: 42.86% no bonus
Hotenow Caldera (Acquisitions Inc.)
Character Level: 25
Gear: 155
Enchantment: 9
Runestone: 5
Bonding: 90
Companion Player Bonus: 100
Mount Equip Bonus: 10
Insignia: 20
Campaign Boons: 18 per boon
Stronghold Boons: 35.71% no bonus
Basement Investigation (Acquisitions Inc.)
Character Level: 20
Gear: 126
Enchantment: 7
Runestone: 3
Bonding: 40
Companion Player Bonus: 100
Mount Equip Bonus: 10
Insignia: 12
Campaign Boons: 8 per boon
Stronghold Boons: 28.58% no bonus
Cragmire Crypts
Character Level: 19
Gear: 109
Enchantment: 5
Runestone: 3
Bonding: 18
Companion Player Bonus: 100
Mount Equip Bonus: 10
Insignia: 14
Campaign Boons: 1 per boon
Stronghold Boons: 27.14% no bonus
Orientation (Acquisitions Inc.)
Character Level: 15
Gear: 88
Enchantment: 2
Runestone: 1
Bonding: 10
Companion Player Bonus: 88
Mount Equip Bonus: 10
Insignia: 10
Campaign Boons: 1 per boon
Stronghold Boons: 21.43% no bonus
Cloak Tower
Character Level: 12
Gear: 70
Enchantment: 1
Runestone: 1
Bonding: 1
Companion Player Bonus: 70
Mount Equip Bonus: 10
Insignia: 10
Campaign Boons: 1 per boon
Stronghold Boons: 17.14% no bonus