SCI FI Wire talked to Batman Begins producer Charles Roven about a possible sequel:
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.”
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Source: Sci Fi Wire