I think we will see each iconic subclass, 1-2 new subclasses per class, and 1 high-satisfaction subclass.
Rogue might have Thief and either Arcane Trickster or Swashbuckler, and two new archetypes, for instance.
So, Thief, Hunter, Champion, College of Lore, Oath of Devotion, Way of The Open Hand, Circle of The Moon, Path of The Berserker, Fiendish Patron, Draconic Origin, Life Domain, and Evocation Wizard.
Beyond that, I don’t think they’ll put things like Bladesinger or Gloomstalker, that are very popular options in one of the major expansions (Tasha’s, Xanathar’s, the ones coming next year), in the new PHB.