From the looks of it...stealth will be used in the game along with your vampire powers. There's only a few vampire powers shown in the video. Shadow Leap allows you to instantly move from one place to the other (not sure if he is teleporting or just moving really quickly). Another power is Shadow Kill in where the character instantly moves in front of an enemy and deals him a killing blow (probably only kills the weaker enemies in one hit). Also, the Vampire Vision is shown as well. This allows you to see thru walls, basically. You can spot enemies alot more easily with this.
I'm curious in what other powers you'll have and how you'll gain and/or level up your powers. Also, there seem to be multiple ways to take out your enemies. Just killing them or by sucking their blood (to fill your blood meter).