Artists and Bands

Black Sabbath Reunion is on

Black Sabbath are getting together again for Ozzfest this summer but why isn’t Bill Ward involved? Anybody know?
UPDATED Bill Ward provides his reasons in a letter quoted on I Ate Your Microphone. Sounds like contract stuff reminiscent of the whole Peter Criss fiasco with Kiss.
UPDATE#2 According to Bill Ward’s official site he may now very well be part of the reunion after all.