According to Batman Begins producer Charles Roven, the cast (including Katie) has signed on for the sequel. Here's the story c/o Sci Fi Wire:
Batman Sequel Proceeds
Batman Begins producer Charles Roven told SCI FI Wire that the cast is signed on for a sequel, the script is in the works, new cast members are being discussed and the only delay is an OK by director Christopher Nolan. "We all hope there is going to be another one," Roven said in an interview for the upcoming Terry Gilliam film The Brothers Grimm, which he also produced. "We're waiting for Chris Nolan to declare himself. We will do it after he does that."
Batman Begins star Christian Bale has signed on to reprise the role of the seething and dark Bruce Wayne/Batman, as have Michael Caine as the butler Alfred, Katie Holmes as the love interest Rachel Dawes and Gary Oldman as police detective Jim Gordon, Roven confirmed.
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