Just days after John Mellencamp leaked his own induction, the Rock and Roll Hall of Fame moved up its official announcement of the 2008 Inductees by a month to Thursday, December 13th. It is then that we'll find out who will take the remaining four slots in the 2008 class.

The Cleveland Plain Dealer's John Soeder also reports there will be inductees in the Non-Performer and Sidemen categories, which haven't been given out since 2003. No word on whether or not there will be a Lifetime Achievement recipient this year.

The 2008 Rock Hall Induction Ceremony will be held March 10th at the Waldorf-Astoria Hotel in New York City. Presumably, AOL's spinner.com will be webcasting the ceremony once again, but that hasn't been announced yet.