Regeneration Time For Matt Smith?

So the rumors of Matt Smith leaving "Doctor Who" have started up again and this time they are saying that he could be leaving in the shows Series 8 or even earlier in the shows Xmas Special. 
The rumors are also saying that the BBC have got the actor for the 12th Doctor in mind already. If this is true, we probably will find out with in the next few months obviously, because Smith's contract finishes this November and everyone is unsure if he will indeed sign another one for one more year or if this years Xmas Special could actually be his very last time as The Doctor. The BBC commented last night on the rumored departure, 

“Sorry folks but even we don’t know what’s going to happen at Christmas. It’s not been written yet! But Matt loves the show and is to start filming the unmissable 50th anniversary, and the new series starting on Easter Saturday.”