This is completely ridiculous. Firstly, Ozzy was fired in 1979 and undoubtedly was deprived of any rights to the Black Sabbath name at that time. And he's finally getting around to suing over it 30 years later? Iommi's lawyers should have a field day with the statute of limitations on this one.
I'm trying to think of a way that Ozzy didn't lose his right to sue years ago, but I can't think of anything. And basing it on trademark rights rather than contract or property rights doesn't work either. Trademark rights don't expire the way patents and copyrights do, but you can't sit on your rights, either. You can't simply wait around for three decades and then sue, especially given that Ozzy knew the whole time that Iommi & Co. were using the Sabbath name.
If I'm Iommi, I'm demanding payment of attorneys' fees and sanctions for such a crap lawsuit--take some of Ozzy and Sharon's money.
My understanding of the Ozzy/Sabbath reunion a decade ago was that Iommi retained ownership of the Sabbath name but agreed not to use it without Ozzy for some period of time. And Iommi has certainly lived up to his end of the deal, with the "Heaven & Hell" thingy.