At some point, the Doctor will regenerate again. This is a device to allow different actors to play the same character over several decades. Regeneration causes not only a different physical appearance, but a new emotional outlook and new personality. Look for Matt Smith's Doctor to regenerate some time after the fiftieth anniversary season begins in 2013.
No, not yet anyway, he's doing another series.
Updated answer;
The 2013 Christmas special will be Matt Smith's last episode as the Doctor.
Matt smith (Doctor Who)
Matt Smith is the new Doctor.
No, David Tennant plays the Doctor in that episode. Matt Smith isn't in it.
Yes, he is.
Yes.
Yes, Matt Smith is currently portraying the Doctor in Doctor Who.
The new doctor is Matt Smith.
The 11th Doctor in Doctor Who is portrayed by actor Matt Smith.
Matt smith (Doctor Who)
Matt Smith is the new Doctor.
The Tenth Doctor (a.k.a David Tennant) did not die. In fact, he regenerated into the Eleventh Doctor (a.k.a Matt Smith).
Matt Smith
Matt Smith
No, David Tennant plays the Doctor in that episode. Matt Smith isn't in it.
Jodie Whittaker was the thirteenth Doctor Who, following Peter Capaldi who was the twelfth. The eleventh Doctor was portrayed by Matt Smith.
Matt Smith is the eleventh Doctor.
Matt Smith.