The 16-month calendar is due for release on 15th July 2012, and will cover 2013 and the first half of 2014. The previews only feature images from previous series, most notably series 6, so give us no clues towards series 7, unfortunately.
It’s a little disappointing to say the least, but plans are afoot for a 12-month calendar celebrating Doctor Who’s 50th anniversary. (My guess is: a Doctor per month, then one featuring some of his major foes, like the Daleks, Cybermen and Absorbaloff. Ahem. Maybe.)
Best wait for that one, eh!