The Comic Reel has possible casting news for X-Men 3:
Apparently, Marvel’s production company is auditioning actresses to play a new 17-year-old female lead character, based on a recent rewrite of the script. The source believes this to be Kitty Pryde stepping into the spotlight, replacing Katie Stuart who was briefly on screen in “X2.”
Stay tuned for more on this.
Source: The Comic Reel