Originally Posted by CJMPinger
Pathfinder is a completely different system. On classes and subclasses we have an actual chance to get if Larian gets closer to 5e (* means already in BG3. PHB = Player's Handbook, XGE = Xanathar's Guide to Everything, TCE = Tasha's Guide to Everything, SCAG = Sword Coast's Adventurer Guide, EGW = Explorer's Guide to Wildmount, DMG = Dungeon Master's Guide):

Wizard*-
- PHB: School of Abjuration*, School of Conjuration, School of Divination, School of Enchantment, School of Evocation*, School of Illusion, School of Necromancy, School of Transmutation
- XGE: School of War Magic
- TCE: Bladesinger, Order of Scrubes
- EGW (Wildmount stuff seems unlikely but will list regardless): School of Chronurgy, School of Graviturgy

Warlock*:
-Patrons
- PHB: Archfey, Fiend*, Great Old One*
- SCAG: Undying
- XGE: Hexblade, Celestial
- TCE: Genie, Fathomless
-Pact Boons
- PHB: Pact of the Chain*, Pact of the Blade, Pact of the Tome
- TCE: Pact of the Talisman

Sorcerer:
- PHB: Draconic Bloodline, Wild Magic
- XGE: Divine Soul, Shadow, Storm,
- TCE: Aberrant Mind, Clockwork Soul

Rogue*:
- PHB: Arcane Trickster*, Assassin, Thief*
- XGE: Inquisitive, Mastermind, Scout, Swashbuckler
- TCE: Soulknife, Phantom

Ranger*:
-TCE Optional Features (Worth Listing here because they change Ranger.): Favored Foe, Deft Explorer, Primal Awareness, Nature's Veil, Primal Companion (Beast Master)
- PHB: Beast Master*, Hunter*
- XGE: Gloom Stalker, Horizon Walker, Monster Slayer
- TCE: Fey Wanderer, Swarmkeeper

Paladin:
- PHB: Ancients, Devotion, Vengeance
- DMG: Oathbreaker
- SCAG: Crown
- XGE: Conquest, Redemption
- TCE: Glory, Watchers

Monk:
- PHB: Four Elements, Open Hand, Shadow
- SCAG: Long Death
- XGE: Drunken Master, Kensei, Sun Soul
- TCE: Astral Self, Mercy

Fighter*:
- PHB: Battle master*, Champion, Eldritch Knight*
- SCAG: Banneret
- XGE: Arcane Archer, Cavalier, Samurai
- TCE: Psi Warrior, Rune Knight
- EGW: Echo Knight

Druid*:
- PHB: Land*, Moon*
- XGE: Dreams, Shepherd
- TCE: Spores, Stars, Wildfire

Cleric*:
- PHB: Life*, Light*, Trickery*, Knowledge, Nature, Tempest, War
- DMG: Death
- SCAG: Arcana
- XGE: Forge, Grave
- TCE: Order, Peace, Twilight

Bard:
- PHB: Lore. Valor
- XGE: Glamour, Swords, Whispers
- TCE: Creation, Eloquence

Barbarian:
- PHB: Berserker, Totem Warrior
- SCAG: Battlerager
- XGE: Zealot, Stormherald, Ancestral Guardian
- TCE: Wild Magic, Beast

Artificer:
TCE: Alchemist, Armorer, Artillerist, Battle Smith

(Very Unlikely but listed on D&D Beyond so worth mentioning)
Bloodhunter:
- D&D Beyond: Order of the Ghostslayer, Order of the Lycan, Order of the Mutant, Order of the Profane Soul

Essentially that is every class (unless I missed one or two) that has the potential to be added to BG3. I would certainly hope that all of them get added (except maybe Bloodhunter, even though I love it, it is not considered "official" yet so hopefully it gets actually published at some point in an official book when it is fully balanced) so we get a complete D&D 5e experience where people can make whatever character they desire to make. Notably, most all of these classes were made with the Faerun setting in mind, especially those in XGE and SCAG but to a lesser extent TCE. So everything here would fit in BG3 lorewise. I do realize everything being added is a tall order and not that likely but a summoner can dream (atleast I'll get Conjuration Wizard).

Exactly. There is so much yet to come, even if we are only counting the other base classes and the subclasses spanning the PHB, SCAG, and XGE. Not to mention the myriad of races/spells to be implemented on top of all of those. It's a lot to take on, but if Larian does this right, it will make for a lot of replayability!