Re: Matthew Vaughn Helming X-Men: First Class Sequel
The trades were just quoting TOLDJA but they put words in their mouths saying everyone was confirmed to come back. Right now the only people confirmed coming back are Vaughn, Singer and Kinberg.
Lionsgate wants to get filming going on Catching Fire by this Spring, in the event The Hunger Games take off like many expect. Fitting in Lawrence for both that and X-Men: Second Class will be next to impossible since both are gearing up around the same time and both gunning for 2013 releases.
She's signed up for more X-Men, yes, but contracts can (and regularly are) bought out. The only actors I'd say are definite to return are McAvoy and Fassbender personally.