So here's Moffat talking about the film on the radio today:
"David (Yates) was talking a little out of turn, there; a very, very brilliant director but no the film as described by him, of course we're not going to do that - a film that contradicts the television series, it would be a heathen thing to do ... I would be 'beheaded' to do such a thing!
It would be wonderful to do a Doctor Who film, but when and if we did - and hopefully we will be doing it - it will be very much an offshoot of the television series and we'll be part of it, and it will star the television Doctor, of course - anything else would be heresy!"
You'll note of course that he doesn't say (and has never actually said come to think of it) that Yates isn't involved in developing a DW film; just not one that would contradict the TV series.
I don't remember Yates claiming that a film would contradict the television series, I think that the implication was that it would ignore it. And even then I find it difficult to believe that someone who I seem to remember as being an affirmed fan of the canon contradicting Cushing movies would describe them as "a heathen thing to do".
Basically, I think Moffat is half walking back his earlier statements and adding a bit of his usual fandom trolling for the fun of it.