The Dawnguard trailer showed us about Vampires so we are able to transform into Vampire Lord.

Will it be happen to Dragonborn ? Can we transform into DragonPriest and have a DragonPriest perk ?

I'm sure

sorry lad Dragonpriests are just lichs and to be a lich you need to be pretty strong with undead magic and being pretty dead,call me crazy but i pefer being alive and having skin thank you very much