From Neil Gaiman’s own Twitpic feed:
That’s Gaiman on the right, Steven Moffat in the middle, and Richard Curtis (who will also be contributing a script to an upcoming series of Doctor Who) on the left. (Thanks to the many readers, including Kat and Keith, who sent me this via email and Facebook.)
That’s pretty much the whole story. Gaiman is even covering up the episode title with his fingers so we can’t begin to speculate on what his episode is actually about. Bastard.
Other writers whom I insist contribute to Doctor Who:
Robert J. Sawyer
And me, of course.