Ten things about the Vampire Lord.
10. You can't sneak or crouch as a Vampire Lord.
9. The button layout will be different from the normal one and different from the Werewolf button layout.For example,pressing X (Xbox360) on your controller will switch between claws and magic.
8. Some abilities like the swarm of bats teleport(dodge move) will have a cooldown timer like the dragon shouts.
7. It seems that you can only play in the 3rd person view(not confirmed).
6. You can only access the Vampire Lord's perk tree while transformed.You can't access your inventory while you're in Vampire form.
5. You can only use spells from the Vampire Lord's perk tree while transformed.
4. You can stay transformed as long as you want.(no bloodlust like a Werewolf)
3. Skyrim's NPCs will no longer react with hostility toward any regular vampires, only with Vampire Lords.
2. If the player is a werewolf and becomes a Vampire Lord, the player's lycanthropy will be cured. Later, however, the player can give up being a Vampire Lord and return to being a werewolf if desired.
1. The Vampire Lord will have a few basic abilities like the normal Vampire.Including stuff like the swarm of bats dodge move,vampire sight and raise dead.
Sources are:E3 Interviews and gameplay footage of Dawnguard,DTIOD hands on Dawnguard,Gameinformer articles and others,uesp


