Apple are claiming it offers over 200 new features like Notification Center, iMessages, Reminders, Twitter integration and finally includes the ability to sync with your iTunes library over Wi-Fi. More on iOS 5 http://www.apple.com/ios/
Apple are also introducing iCloud. A free service that stores your music, documents, photos and even backups of your device in the cloud and then syncs them to all your other iOS/Mac/PC devices over the air. iCloud also includes a free email account, calendar and address book as replaces the MobileMe. Migration from MobileMe services are now live and MobileMe users can move over all MobileMe data to iCloud. More on iCloud http://www.apple.com/iphone/icloud/ and you can access iCloud here https://www.icloud.com/
iBrothers have been using iOS 5 during it’s beta testing period and have found iOS 5 to be a huge improvement over previous updates and in fact, maybe one of Apples biggest updates yet to it’s mobile OS platform. While iMessage, the new camera controls from the lock screen and reminders are great, the new notification system has to be the standout feature introduced with iOS 5. We highly recommend everyone with a device that supports it to upgrade immediately when available.
iOS 5 requires iTunes 10.5. After you have updated to the latest version of iTunes and connected your iDevice, click “check for updates” to automatically download and install iOS 5.