I was just watching the Christmas Carol episode on
iPlayer, and I don't think I've seen the "Coming Soon" bit at the end of that episode before.
It looks quite promising for the new series, more River Song obviously, but what looks like period drama again (it worked pretty well with The Girl in the Fireplace), Nazis, what could be Kennedy era US special agents (a who killed President Kennedy storyline, or would that be too cliched?), the Ood, mention of a Stetson and a fez, and what looked like the interior of the spacecraft from The Lodger.
(It's at around the 1 hour 40 seconds point).
... and the new series starts next Saturday, which I hadn't realised until I hunted around a bit. Yay!