That's if Moffat is even working on DW next year.The earliest they can begin filming is June. This is confirmed fact. Therefore, they can't do a full season for next year. Simple logic.
Is that confirmed? If so, where? I heard a potential for that but nothing beyond rumors. You may well be correct, if that's true. I just hadn't heard it officially.
I suspect that The Wormhole is referring to the Sherlock filming, which will be April to June, and the fact that the scripts for Sherlock haven't been written yet nor preproduction work done. I might not say that it's a "confirmed fact" that Doctor Who won't film until summer 2016 at the earliest, just very, very unlikely.
And I say that using "if" since everything here is speculation.