Software Fix and a Press Conference
A beta version of iOS 4.1 was seeded to developers today (you'll need an active iPhone Developer account to follow the link), which includes, among other things, the software side of Apple's response to the iPhone 4's reception woes. Apple are also holding a press conference this Friday, presumably to try and put a lid on the whole thing once and for all. I still think it's unlikely they'll go any further than this weak software fix, although there's probably still a slim chance they'll start shipping free bumpers.