I can understand one trailer that's just trying to be mysterious and raise excitement for the special, but this makes two in a row that have revealed basically nothing at all, only basics like the title, date, and just now, the addition of a standard "this is a big deal" narration. If you add the Comic-Con trailer, which hasn't been leaked in full (to my knowledge, at least), but reportedly didn't contain information above the "There will be Daleks in it" and "that other-Doctor you saw in The Name of the Doctor is going to be in it too, because why wouldn't he be" caliber, it makes me think that the Doctor Who production team isn't just keeping this under wraps for the sake of dramatic mystery.
Are they afraid saying anything at all about it is going to be disappointing? Because they've been stirring up so much hype for the special, and yet revealing essentially nothing on any front above rumors and Moffat-misdirections, it makes me think that they're less than confident with the final product, which in turn makes me less confident that they did a good job with it.
I hope I'm just jumping to conclusions. I hope it's awesome. It deserves to be awesome.

(And quite an interesting day at school. Half my school is obsessed, and I live on the west coast of the US! I can't even imagine what it would be like in Britain.)

-Aila

I am so looking forward to that :)