In a story from The Leaky Cauldron it appears that Bill Nighy (Pirates of the Caribbean: At World's End) has been cast in Harry Potter and the Deathly Hallows.

The only problem is that we don't know in which role.

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"I don't think I'm allowed to say it but I'm going to be in the next Harry Potter film," Nighy says. "I won't say which character, but he's a goodie. I just got the gig."

It seems the actor most likely will be playing the character of Rufus Scrimgeour, though nothing is confirmed.