But every rumor/report points to 10.2 coming out in mid August, I bet it will fall into sync with the "actual" realease of the new PowerMacs that are announced at MWNY (they rarely start shipping the day they're announced)... It will probably be pre-installed on these new machines.
Probably will be on all the machines at MWNY, but will be released later. It will probably have a part in Job's keynote too, along with the DDR G4 and other gadgets he has up his expensive, black, Armani sweater's sleave.