In terms of gender, will the new vampires suffer from the same problem as werewolves (female characters will have a male form when they transform)?

Also, are the new vampires the same ones as in the main game or are they a completely new breed?

They are very different from the base vampires. Check out the trailer if you haven't.

Female werewolves had an ingame model, I don't know why they were removed.

I think the brief few frames of that vampire early in the transformation into a swarm of bats does give the impression it was a female vampire, whether the player will look like a winged nosferatu as both genders and if the models look any different is something not yet revealed.

So you are calling for womans rights lol? I agree, it would look silly to turn into the lord in the trailer as a female.