Right now the levels of curiosity have been driven sky high into what will be announced by Google and Sun later today.
Both external and internal to Sun at least.
My money?
I place it on something along the lines of Google Sound/Music Search.
A kind of music referral service, if you will – “the software likely wouldn’t be sold separately, but instead be added onto its servers” and resold to the Napsters and iTunes of this world. The theory fits in with Jonathan Schwartz’s software service and delivery ideas, although not very tightly.
But that’s just a guess.