Tennant's there, go to the 2:10 spot in the trailer. They've seriously downplayed his role in the film.
I notice some of Marti Noxon's small Buffy touches in the trailer. And there are some definite deviations from the original film, which can't be a bad thing. Colin Farrell doesn't have that smoldering intensity Chris Sarandon has, but he has presence nonetheless.
"Aliens conquering Earth would be fine with me, as long as they make me their queen."
- Gillian Anderson