Anything they did to the vampires would be a improvement. They are seriously lame.
Come on, they don't even feed by attacking or after entrancing or killing? What kind of lame vampires are they!
I wish they would put vampire lords in.
Werebears would be awesome.

Indeed, in fact there was a vampire feeding kill animation in the video.
What vampires need is: bonuses to one/two handed weapons, brawling, sprinting, jumping and an improved vampire drain.
as for potential weaknesses to counter these: weakened when on holy ground and vampire hunters who possess blessed/holy silver weapons.
More powers could be added such as a vampire version of become ethereal since the volkihar are supposed to be able to phase through solid ice and a vampiric frost breath that freezes enemies solid and drains their health.
Feeding to get stronger would be good as well, the whole starvation power thing is only for "the order" and was quite disliked by many.
The Vampire lord is definitely a power that would be liked a lot if added into the game, it looks brilliant.
Vampire quests would be good as well, Daggerfall vampirism was great, you would get letters from vampires or vampire hunters which would trigger quests or events, vampires had great stats and could levitate as well.
The Werebear could be used as a rival to werewolves and such a battle between the two would be great, the player could become one of the two strains of lycanthropy and have unique quests that will eventually lead up to to a confrontation between the two packs. (perhaps to prove who hircine favours more etc)
Werewolves could do with an upgrade as well, that perk tree was a good idea but they should add forced transformation once every in-game month which can only be avoided with the ring of hircine.
While all this being added is doubtful, it is something that we would like to hope could be implemented in a future dlc as lets face it, the vampires svck. they got the worst traits from both oblivion and morrowind WITHOUT the increased skills. Werewolves were decent but some say they are useless at higher levels and now because their armour rating is 0 because of a patch screw-up, they are right.