Update 1: iOS 5 Final version has been released for Download and Jailbreak - Click Here
Some bad news for iPhone 3GS owners, it looks like that Apple is going to abandon iPhone 3GS, Eldar Murtazin the edito-in-chief of Mobile-Review reported that iPhone 3GS won't be upgradable to iOS 5.x, and it will be available only for latest iOS devices and of course Apple's new-generations.
Just one comment. Apple iPhone 3Gs wont be upgradable to iOS 5.x. iPhone 4 will.
When Apple released iOS 4 in summer 2010, for example, the company made sure it could run on the iPhone 3G, 3GS and iPhone 4. It was only with the first beta of iOS 4.3 (seeded in January) that Apple dropped support for the iPhone 3G and iPod touch 2nd gen — older devices the software team at Cupertino thought wouldn’t be capable of running the latest versions of iOS anymore. And again, Apple “unofficially” confirmed they were dropping support for the original 2007 iPhone in 2010, when Steve Jobs replied to a customer email and said Apple wouldn’t update the original iPhone in the future. Indeed, the 2007 iPhone can’t run iOS 4.This informatinon didn't confirmed so far, moreover it is unlcear Murtazin's source of such information. Anyway we may got more on this soon, stay tuned.