Prez Art Gorski clarifies questions about Lion, Leopard and the iCloud. "I've got Lion installed on my new MacBook Air, but my 4 year old Mac Mini still runs Snow Leopard. Rather than upgrade the memory (which I think will be required for good performance with Lion), I've decided to leave Snow Leopard on the Mini until I replace it within a year or so.
"In Apple's announcements today, the iCloud presentation only mentioned Lion, and not Snow Leopard, and there is no solid information on the Apple web site. However, over on the MobileMe discussion forum (Apple Communities), there is a thread with a screenshot that's interesting. A developer testing iCloud opened up the old .Mac system preference on a Mac running 10.4 and the dialog said he couldn't activate .Mac (remember, this is 10.4, so it wasn't called MobileMe yet) because he had upgraded to iCloud. The interesting part of the dialog said he needed to upgrade to 10.6.9 to use iCloud."
Art summarizes, "So it looks like Snow Leopard may very well be supported, and that there will be a 10.6.9 update coming out before iCloud goes live this month."