According to Ross Halfin's website (www.rosshalfin.co.uk), Ozzy has recorded a cover of John Lennon's "How", which Ross was lucky enough to hear.
Ozzy was due to release disc 4 "Under Covers" from the "Prince Of Darkness" box set on it's own this summerwith some additional tracks. Who knows if it will ever be released. This is just another track to add to the "unreleased covers list" that we know of:
"How" (John Lennon)
"Hi Ho Silver Lining" (Jeff Beck)
"Rocky Mountain Way" (Joe Walsh)
"Woman" (John Lennon)
"Go Now" (Moody Blues)
I sent an e-mail to my contact at Sony music last week about a release date for this... still waiting for a reply. Will let you know if I hear anything!
UPDATE! Chris Robertson just pointed out to me that Amazon.com is listing this item for an October 4th, 2005 release. Although this is nothing official yet, it still looks promising!