Recently Apple has released iOS 5.1 Beta for Apple i-devices, i.e., iPhone 4S, iPhone 4, iPhone 3GS, iPod and iPad. Although the new features of this update has not been confirmed, but according to many Apple Devs this update is an improvement of SIRI integration. You can download iOS 5.1 Beta by logging into your Apple Developer account.
Apple will soon release the final version of iOS 5.1 with many performance improvements. This version also aims to improve the battery performance of the latest i-devices. You can only download this beta version from Apple Developer account. If you don’t have the developer account then you have to wait till the release of final iOS 5.1 version or you can opt for Apple Developer account only for 99$/year.
The final version of iOS 5.1 is expected to be released in the first quarter of year 2012, but if you are so much excited to try this beta update then you will surely like to go for the Apple Developer account. This will allow you the access to all the latest updates before it go out for public.