"You want me to get into trouble, don't you?" replied Jackman when asked to provide a scoop on The Wolverine. "Okay, the movie takes place after X-Men: The Last Stand. My character is at his lowest. He is supposed to be able to heal himself, but he may encounter someone who has worked out a way to really hurt him. And there is a cameo from one of the past X-Men in it."
Back in October it was reported that Famke Janssen had flown out to Sydney to film a cameo alongside Hugh Jackman, so it would seem there's a good chance that Jean Grey is set to return to the X-Men universe once more. There's been a lot of speculation online about the character being resurrected by the Phoenix Force, but going from Jackman's comments, I'd say it's more likely that she'll appear in some kind of dream or vision (assuming it is Jean, of course).
After he finishes up with The Wolverine, Jackman is set to line-up as part of Bryan Singer's X-Men: Days of Future Past - a sequel to X-Men: First Class which sees James McAvoy (Professor X), Michael Fassbender (Magneto), Jennifer Lawrence (Mystique) and Nicholas Hoult (Beast) joined by original X-Men trilogy veterans Patrick Stewart (Professor X) and Ian McKellen (Magneto) as they battle to prevent an apocalyptic alternate future where mutants are hunted and killed by Sentinels.
The Wolverine is set for release on July 26th, 2013, with X-Men: Days of Future Past following on July 18th, 2014.