There is lots of chatter on the internet that Apple could release Mac OS X Snow Leopard 10.6 on Friday, August 28.
Here are a couple of links on Apple’s website about Snow Leopard:
“…only Apple OS X Leopard users are eligible for the Snow Leopard upgrade. Tiger & earlier OS users will need to purchase either versions of the upgraded Mac Box Set. Also, Snow Leopard will only run on intel-based Mac computers.”
“…Official release date has not been announced by Apple…”
“You may pre-order it now and we will deliver it to you when it arrives.”