Wow, that's exactly 50 types of elves! Here's you spoiled god dang brat.
Vampires can be good, as long you pretend twilight and all those other vampire-romance mishmash piles of lunacy don't exist.
Uh... now... at the risk of being murdered... I actually do like TruBlood, which is a good vampire romance. "Let me in" is also a really good vampire romance movie on the account of being super fucking creepy. They really play up the "you're having a relationship with a horrific killing machine ravenous for blood" deal. The actors are actually young teenagers too... yeah, it's creepy. It's worth watching, but only if you like your movies served up with a shit load of weird like I do.
Well, point is, don't knock on a subgenre just because of one super shitty movie in it. "Let me in" is just about as far from Twilight as a movie can be and still be in the same category.
Regardless, i am sure they can come up with enough variation among 12 different factions to keep it intresting.
I'm the only person who probably thinks this way, but I'm excited that there's only going to be two different main races. I noticed this phenomenon as the Warcraft series just started adding more and more races beyond just Orcs and Humans. The more complicated the setting became, the more I really stopped caring about the setting in general. Warcraft I had a really simple premise and a really strong dark theme and flavor to it. Warcraft as a setting has been getting progressively worse as they've expanded it. Warcraft II was pretty strong, Warcraft III was meh, and WoW is just a clusterf*ck. The Draenei or whatever to me just proves to me they've really jumped the shark. Oh, and wolf people.
Starcraft so far isn't plagued by these problems and so far is a very compelling setting with so far an interesting story. The whole "Xel'naga returns" scares me just a little, because I have this sense they're poised to pull off a... a "Demonica ex Machina" like they did with Warcraft III.
Regardless, I think when it comes to building settings a little bit of the KISS principle goes a long way, especially in fantasy. Six detailed and varied human factions versus six detailed and varied Fallen factions? I couldn't ask for much more.