while this is wonderful news, I believe this is volumes better:
Shortly after Heaven and Hell announced their plans, the Osbourne camp issued a lukewarm statement. "Tony Iommi and Ronnie Dio are working on a project together which has nothing to do with Black Sabbath," it read. "There is only one Black Sabbath. Ozzy, Tony, Geezer and Bill will be touring late next year along with a new Black Sabbath album. However, Ozzy wishes Tony and Ronnie much success in their project together."
This was announced quite some time ago, but I guess they're just doing press for it now. While nothing can touch the original Sabbath (including the new CD with Ozzy, which I have low expectations for), Dio was a solid replacement.