IGN Filmforce has received some more info from their source on X-Men 3:
IGN FilmForce’s secret X3 source advised us that Anna Paquin is signed to return as Rogue and that the Danger Room will finally be seen. Our insider reiterated that a male Angel will be in X3, along with Beast and Gambit. They also denied that the Sentinels will be in X3, as was reported yesterday at XMenFilms.net. Our source, however, refused to comment on the site’s other claim that the film’s villain will be Dr. Bolivar Trask.
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Source: IGN Filmforce