We know little to nothing else about it though, except that Matt Smith likes it so much he clapped and also it’s epic and hilarious too (Matt's words, not mine).
Steven Moffat commented, "One length I've gone to which is a really good security measure - I make sure I don't get a script, because I will lose it." Which is smart thinking really until you read, "I forbid people to hand me one. It's on my computer at home under lock and key," then you think this is waving a red rag to all the would be happy hackers out there who can’t wait to have a glimpse.
Other than that we know nothing more on this. We know of no other actors involved apart from John Barrowman and Matt Smith, so if that’s all it will certainly make interesting viewing.
Doctor Who returns to the BBC on March 30th.