Let break it down confirmed by Class
Barbarian: none confirmed
Bard: College of Glamour (1)
Cleric: Forge Domain confirmed.
Druid: Circle of Dreams confirmed
Fighter: Arcane Archer, Cavalier, Samurai confirmed
Monk: None Confirmed
Paladin: Oath of Redemption
Ranger: Horizon Walker
Rogue: inquestive
Sorceror: Shadow, Divine Soul
Warlock: Celestial Patron
Wizard: unconfirmed
So that is 12 revealed so far, 12 more coming, if it ends up under 30 UA subclasses, that is up to 6 free agent subclasses that could belong to any class.