ive found this site called Dr who spoilers and i couldnt help but have a look and i would say its worth looking at.
tbh these forums are probably more filled with spoilers than that website, although there are a few bits i would advise most people to keep away from unless you dont mind being spoiled a little bit. But reading down the pages they have they havebeen wrong before so it is probably classed more as a rumor and speculation site (not forum). I just think its good to add to anyone's theorys/specilation.

So here it is open at own will...

[SPOILERhttp://doctorwhospoilers.com/2011/the-2011-series/general-information/][/spoiler]

I think the site belongs to someone on Gallifreybase, so the spoilers come from there