Yeah. I haven't seen it up anywhere else yet...
Not another source, the same source - it reiterates the information and sites the 1st source.
Personally that plot sounds pretty dubious to me. It's far to convoluted for such a film to be successful with a mainstream audience, and Marvel isn't going to risk their franchise piece.
Indeed, with as many cast members in the Avengers, I'd have a hard time seeing large elements of screen time devoted to the badies.
But I guess we'll see.