The Skyrim: Dawnguard add-on gives you a new perk tree that can be applied to either Transformed state (Vampire or Werewolf). Remember, you can only be either a Vampire or a Werewolf, not both.
Upgrading the Perks
To unlock perks, you must feed on fallen NPCs or creatures after acquiring the Savage Feeding Perk. Each perk will take a few more feedings than the last. To complete the skill tree you will need to feed on 164 targets. You can only upgrade Perks while in you are transformed.
The first perk is unlocked after 5 feedings. The second perk is available after you have fed on 6 more corpses. The third, 9 corpses. After that, it will take 2 additional feedings from the last. This caps out at 25 feedings for the final perk.