"Show boss Steven Moffat is close to completing a script which will see the current Doctor, Matt Smith, needing the assistance of ALL his police box predecessors – even if three of them have died."Like the best genus of these things, the article features not a single source, not even a Mail patented person "close to the project" or "unnamed source". It's a mishmash of wishful thinking, non-denial denials from the potential stars and qualifications (would, could, may).
"The half-century special, to be broadcast in November, will use studio trickery to resurrect the first three Doctors – William Hartnell, Patrick Troughton and Jon Pertwee – in brief flashback scenes."
All of which said there's one element that this story has which did make the blood rush to my fan gene, which is the idea that River Song would be the key to bringing the various incarnations together against the Eleventh Doctors wishes.
Well. For one thing this sound in character for her and him, especially since as we know from (I think) The Silence in the Library, her diary has images of "all" his incarnations, so she would at least know what they all look like.
This does sound like a very Moffat-like thing to do, mixing the opening sections of The Pandorica Opens with the time scoop sequence from The Five Doctors. To be really Moffaty, it'd be called The Twelve Doctors, the tease.
But of course it's (probably) all old rubbish. We won't really know what's happening for at least a couple of months and even then just something sketched in via a press release from Cardiff and even then ... oh sigh ... you see what happens ...? Just be nice to have a source.