Hugh Jackman is in talks to join X-Men: Days of Future Past, the sequel to X-Men: First Class, as Wolverine, according to Hollywood Reporter.  Jackman would be the third actor from the first three X-Men movies (two of which were directed by Bryan Singer); Singer announced yesterday that Patrick Stewart and Ian McKellan would appear in the film (see "Stewart, McKellan in 'X-Men' Sequel") in their original roles as Professor X and Magneto.
The mixed continuities will be possible because of the storyline, which involves an alternate future.