Exciting news today is the announcement of iOS 5 and iCloud at WWDC 2011. Apple brings tons of fantastic new features to us. The iOS 5 is said to include more than 200 new features, such as Notification Center, iMessage, Newsstand, Reminders, Twitter, Camera, Photos, Safari, PC Free, Mail, Calendar, Game Center, Wi-Fi Sync, etc. You can view the details on Apple website.
iOS 5 won’t be ready for the masses until this Fall, but lucky developers — and eager tech bloggers — are able to get in on the action right now.
iOS 5 will be made available this fall, with compatibility promised for the iPhone 4 and 3GS, iPad 1 and 2, and iPod touch 3rd and 4th generation.
The most important part should be iCloud, which is seamlessly integrated into your apps, so you can access your content on all your devices. It stores your music, photos, apps, calendars, documents, and more. And wirelessly pushes them to all your devices â€” automatically. Itâ€™s the easiest way to manage your content. Apple offers 5 GB storage for free. Learn more about it on Apple iCloud.
Engadget has a very detailed preview about iOS 5 and iCloud, you can take a look.