In the latest issue, he says in regards to series 6:
"You've seen more than you think. the Doctor has noticed what you have not. And when the biggest jaw-dropping twist finally comes - well, the second one - you'll realise you've known about it from the very beginning..."
Also, putting rest to all the series 1/Fnarg/31/5 debates, he claims he has only ever seen the last series as series 5, and never anything else. And to think I was just warming to the idea of Fnarg. Some serious backtracking on his part considering he started the whole bloody debate in the first place. Cheeky so and so!