According to We got this covered, Famke Janssen flew over to Sydney recently, to the set for 'The Wolverine'. It's rumored that this is in fact for a cameo as he comic book movie character 'Jean Grey'!
This is a rather interesting find, as the actress had said that she was interested to appear as Jean Grey in Matthew Vaughn's X-Men: Days of Future Past.
Another reason for this to be strange news, is that this is a prequel, so in what way can she be included in the movie? You tell me.