Neil Gaiman is in Russia at the moment and even there he couldn't escape questions about his Doctor Who episode but surprisingly has actually been a bit forthcoming about it. As assumed, his episode was originally going to be Episode 11 of the upcoming series but the money ran out* so it got bumped to Episode 2 or 3 of next year's series.
*Apparently his original script would have involved about six times (!) the average amount of CGI work and while it's been reduced since then there's still a lot more than usual in it.
*Apparently his original script would have involved about six times (!) the average amount of CGI work and while it's been reduced since then there's still a lot more than usual in it.