The U.K. newsite, The Independent, reports that actress Helena Bonham Carter has been cast for the sixth Harry Potter film:

English rose Bonham Carter has most recently won plaudits for her portrayal of Harry Potter villain Bellatrix Lestrange, the female Death Eater (boo, hiss).
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She is cast again for the sixth movie, Harry Potter and the Half-Blood Prince, scheduled to begin filming in two months for a November 2008 release. Her publicist said yesterday that Bonham Carter was not due back on the Potter set until the spring.

Harry Potter and the Half-Blood Prince is scheduled to arrive in theatres in November, 2008.