Whatever form of lymphoma he has (and there are a few, with varying degrees of effective treatments...), I wish him all the best of luck in his treatment.
I saw Ozzy in Leeds Town Hall when I was about 14 (I actually went to see Fear Factory supporting them, that was the demanufacture tour, my mate and his parents were huge Ozzy fans), and that was about the first time I'd really come into contact with any Sabbath material. I'm still completely in the dark about most of their stuff, but the bits I've heard have been decent, and they have very clearly made a big influence to metal not just here in the UK, but the world over. Certainly will be interesting to see what they produce this year.
Was it Iommi who played with really flabby strings after some nasty hand incident? Forgive my insane ignorance!
Roo