@DW: Well, they've got to start somewhere at least, and it makes sense to start the films where the games began before expanding to other parts of the Warcraft universe. I'm hoping we get to see some Burning Legion characters, manipulation events from behind the scenes probably. I know we see some Elves, in some of the leaked material there are High Elf Rangers up to something(I think perhaps hunting down Trolls), and you can see some Elven delegates in the trailer. Which is more than we've seen of Dwarves and Gnomes, I don't think we've seen hide nor hair of them.
I'm personally most interested in the Horde, the Legion, and the various Dragon Flights, though I'm worried the Burning Legion and Dragon Flights might get pushed back until later. If you pause in the trailer when Blackhand says "You would betray your own kind to help the Humans" or whatever, you can see each of his pauldrons has a Dragon skull strapped to it.
Also, just before that, when you see an armorless(save for a helmet) green skinned Orc shuffling forward with a heavy shield, you can see the shield has a Demon skull attached to the front of it in some manner(didn't see any straps or obvious). This lines up with some of the promotional material, from the Horde wallpapers you could download from the official Website. So there's hope the Legion reveals itself at some point in the movie for those shields to make sense being in use.
@Super: Me too, I'm dragging my whole family to see it when it comes out. I've been following the film since they first announced they were planning one, I think in 2006. So to actually be getting one after so many years of it bouncing around is a dream come true.
Plus I'll finally be able to get affordable, readily available Warcraft merchandise, instead of expensive specialty stuff, or also expensive crap that's almost as old as me.