Oath of Conquest Paladin for sure
Sorry to be the bearer of bad news, Conquest paladins come from Xanathars Guide to everything, and are unlikely to be added at or before launch.
They are one of my fav subclass too, along with hex blade warlocks and necromancer wizards.
Its why I am so on the fence about the games content choice at the moment. A lot of the more popular subclasses people play on table top (especially true for bards and rogues) are in Xanathars.
Anyway, the class I am really looking forward to Paladins in general, as well as Necromancy for wizards.
