Okay, it's only the cinema trailer that's been out for months but it was still great to see it again. It's online too, check out the BBC's YouTube site, though if you're viewing it from outside the UK then you'll have a hard job.
You can always see it on the official site (or even their BEBO page) but, if you can't wait, then despair not. Just hang on 'til the end of this post.
And, if that wasn't enough, the BEEB also stuck out 3 short teasers. Though I didn't see any of them, bah! One involves the SONTARANS; one, the OOD; and the other, theDALEKS.
As promised, here's the trailer. The aspect ratio is a bit messed up, sorry 'bout that.