Phil Plait doesn't want you to see it (or at least, he doesn't want to see it for himself), but here, in lieu of a new episode this week (bloody Eurovision), is the trailer for the remainder of Doctor Who Series 4. Yes, Virginia, there are spoilers.
Pay no attention to the thing that looks like a Dalek in the shadows. None at all... I'm sure that it's not important in the least.
(The various DW discussion fora are alive with speculation on this point, so I won't add mine. At this juncture, I prefer to sit back and be surprised.)
I can tell you one thing, though - better to download (or otherwise obtain from a friendly source in the UK) than to watch the edited versions on Sci-Fi in the US... the few that I've tried to watch have been cut in seemingly random places, just as BBC America's broadcast of Series 3 was. Infuriating. And yes, before you ask, I buy the bloody things on DVD when the full series comes out, too (or, if I'm cunning, I arrange to receive them as holiday gifts).