While it has been confirmed that Matt Smith will be returning as the Doctor for fourteen more episodes, we won’t be seeing them for a while. It has unfortunately been confirmed that Series 7 of Doctor Who will not air in 2012, and instead be saved for the Doctor Who anniversary in 2013.
There are a lot of rumors as to why we won’t see the Doctor next year, but the BBC has confirmed that Steven Moffat’s commitment to the awesome Sherlock series has nothing to do with the delay. They still aren’t saying why the season is delayed. Moffat is a busy man, so that could factor into it, or it could be that they just want to save all fourteen episodes for the big Doctor Who anniversary.