After rumors that she had filmed a cameo for the film swirled in October, Janssen's involvement was confirmed with the release of the movie's first trailer. When her scene was revealed, the soft lighting and fact that she and Logan seemed to be acting as lovers implied Jean Grey's resurrection was only in a flashback. During an interview with What Culture, Janssen said that's indeed the case.
"I couldn’t tell you [how much I’m in it]. It’s a flashback sequence, but that’s all I can say. You’ll just have to wait until July!" she said (via SuperHeroHype).
Janssen could just be hedging and her role could be larger than she is saying here, but it would make sense in the context of the story for her only to appear in a flashback. If that really is all there is to her part, kudos to Janssen for even deigning to appear at all. Her involvement will help tie this standalone X-Men film back to its predecessors.
Here’s the official synopsis:
Based on the celebrated comic book arc, this epic action-adventure takes Wolverine, the most iconic character of the X-Men universe, to modern day Japan. Out of his depth in an unknown world he faces his ultimate nemesis in a life-or-death battle that will leave him forever changed. Vulnerable for the first time and pushed to his physical and emotional limits, he confronts not only lethal samurai steel but also his inner struggle against his own immortality, emerging more powerful than we have ever seen him before.
The Wolverine also stars Hugh Jackman as Wolverine, Svetlana Khodchenkova as Viper, Hiroyuki Sanada Shingen Yashida, Hal Yamanouchi as Yashida, Tao Okamoto as Mariko Yashida, Rila Fukushima as Yukio and Brian Tee as Noburo Mori. The film opens July 26.