Sigh.
I'm unimpressed by the trailer.
It's funny, but it seems that as the technology/make-up/camerawork improves, the scare factor goes down. 28 Days Later was supposed to be scary, wasn't it? It had a couple of jolts, but creating a jolt is simple enough, you just have the screen change suddenly and crash a big loud chord at the audience. I mean, for a zombie picture that was patently unscary. Likewise for Resident Evil.
The original Dawn of the Dead is one scary movie. Slow-moving zombies are scarier than agile, wire-work-y, cgi-enhanced zombies. Same thing with the Texas Chainsaw Massacre remake. It's prettier and all, but nowhere near as scary.
For Hallowe'en we watched The Exorcist and The Changeling -- especially the latter one is remarkable for how much creepiness it generates without any big effects, screaming teenagers or smoothly-gliding lateral pans past people looking at something offscreen.