It's interesting that no-one seems to be paying special attention to the Sept 30 expiration of Apple's offer of free Bumper cases. In my mind, that hints at a few troubling scenarios that aren't properly addressed by today's press conference:
A) Apple will end up providing free cases for the iPhone 4 indefinitely.
B) After Sept 30, you have to pay for a case to solve a problem with the iPhone 4 that Apple officially acknowledges.
C) After Sept 30, revised iPhone 4 hardware will be hitting the shelves.
Both (A) and (B) seem highly unlikely...which leads me to believe (C) is the likely outcome. But course Apple doesn't want to cannibalize sales of existing iPhone 4 stock and slow down sales momentum, so they're keeping info about revised hardware under a very tight wrap. Maybe that means you should buy an iPhone 4 just yet?