Well that was fast. It seems that Apple has already cooked up a beta version of iOS 4.1. The beta is now available to anybody who is signed up for the Apple Developers Program. There aren’t a lot of updates but iOS 4.1 does feature some new APIs, updates to the yet-to-be-launched Game Center, and confirmed signal improvement. The last one is the biggie. It’s not a definitive fix but sources are saying that they do see an increase in signal. So, if you’re a dev, go ahead and download the beta of iOS 4.1 right now.
Update: It looks like the only signal-related fix the iOS 4.1 beta does provide is to the bar display. No actual boost in signal. Just more accurate viewing of how strong your signal actually is.