I agree with all the "I hope Moffat doesn't really do it" sentiments.
He's in dangerous territory - if he reveals x y and z about the Doctor's past, it's all well and good for the short term satisfaction of audiences, but it's going to severely limit the show in its current state. If there is nothing else drawing the audience in (in that we know everything already), then people will stop watching.
In my opinion, Doctor Who started going down hill a few years ago - when the American audiences started getting on board, it's now all about big secrets, angst, annoying quirky Britishness, etc.
Compare to Ecclestone's Doctor - there was a bit of an overarching storyline, but until the last 2 episodes it was completely on the backburner and the show was effectively serialised.
Imo, Doctor Who works best when it's serialised Star Trek style, with one big bad final boss to end the season - Daleks, Cybermen, Master, whatever.