Tennant's specials: I believe the original plan was to take a year off but the BBC (who can ill-afford to lose Doctor Who revenue) basically begged Russell T Davies to at least do a few one-off episodes to fill the gap.

As for Moffat, a fresh showrunner probably is needed by now but he's in charge of two massive successes for the BBC, so nobody will be pushing him out of the door any time soon.

And I laughed at the ZZ Top line in last night's episode.