I agree with most people here that it's most likely that the 60gb will simply be replaced with the 80gb, nothing more nothing less.
Yeah me too. I don't even think it'll get advertised. People will one day walk into shops and see that 60gb PS3s are now 80gb PS3s, with a change of a single digit on the box. The 80gb might be the only sku, maybe even a 500USD sku by year's end.