Here is the list of features of this new OS
Notifications
◦ Swipe from the top of any screen to view notifications in one place with Notification Center
◦ New notifications appear briefly at the top of the screen
◦ View notifications from lock screen
◦ Slide the notification app icon to the right on the lock screen to go directly to the app
iMessage
◦ Send and receive unlimited text, photo, and video messages with other iOS 5 users
◦ Track messages with delivery and read receipts
◦ Group messaging and secure encryption
◦ Works over cellular network and Wi-Fi*
Newsstand
◦ Automatically organizes magazine and newspaper subscriptions on Home Screen
◦ Displays the cover of the latest issue
◦ Background downloads of new issues
Reminders for managing to do lists
◦ Syncs with iCloud, iCal and Outlook
◦ Location-based reminders when you leave or arrive at a location for iPhone 4S and iPhone 4
Built-in support for Twitter
◦ Sign-in once in Settings and tweet directly from Camera, Photos, Maps, Safari and YouTube
◦ Add location to any tweet
◦ View twitter profile pictures and usernames in Contacts
Camera improvements for devices with cameras
◦ Double click the home button when device is asleep to bring up a camera shortcut on iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (4th generation)
◦ Volume Up button to take a picture
◦ Optional grid lines to line up shots
◦ Pinch to zoom in the preview screen
◦ Swipe to camera roll from preview screen
◦ Tap and hold to lock focus and exposure, iPad 2 and iPod touch (4th generation) only support exposure lock
Photo improvements for devices with cameras
◦ Crop and rotate
◦ Red eye removal
◦ One tap enhance
◦ Organize photos into albums
Mail improvements
◦ Format text using bold, italic, or underlined fonts
◦ Indentation control
◦ Drag to rearrange names in address fields
◦ Flag messages
◦ Mass mark messages as flagged, read or unread
◦ Customize mail alert sounds
◦ S/MIME
Calendar improvements
◦ Year view on iPad and new Week view for iPhone and iPod touch
◦ Tap to create an event
◦ View and add event attachments
Game Center improvements
◦ Use personal photos for your Game Center account
◦ Compare your overall achievement scores with your friends
◦ Find new Game Center friends with friend recommendations and friends of friends
◦ Discover new games with custom game recommendations
AirPlay Mirroring for iPad 2 and iPhone 4S
Multitasking Gestures for iPad
◦ Use four or five fingers to pinch to the Home Screen
◦ Swipe up to reveal the multitasking bar
◦ Swipe left or right to switch between apps
On-device setup, activation and configuration with Setup Assistant
Software updates available over the air without tethering
iCloud support
◦ iTunes in the Cloud
◦ Photo Stream
◦ Documents in the Cloud
◦ Apps and Books automatic download and purchase history
◦ Backup
◦ Contacts, Calendar, and Mail
◦ Find My iPhone
Redesigned Music app for iPad
Hourly weather forecast
Real-time stock quotes
Wireless sync to iTunes
Keyboard improvements
◦ Split keyboard for iPad
◦ Improved autocorrection accuracy
◦ Improved Chinese and Japanese input
◦ New Emoji keyboard
◦ Personal dictionary for autocorrection
◦ Optionally create keyboard short cuts for frequently used words
Accessibility improvements
◦ Option to light LED flash on incoming calls and alerts for iPhone 4S and iPhone 4
◦ Custom vibration patterns for incoming calls on iPhone
◦ New interface for using iOS with mobility-impairment input devices
◦ Option to speak a selection of text
◦ Custom element labeling for VoiceOver
Exchange ActiveSync improvements
◦ Wirelessly sync tasks
◦ Mark messages as flagged, read or unread
◦ Improved offline support
◦ Save a new contact from a GAL service
More than 1,500 new developer APIs
Bug fixes
See full specification on Apple website
feature list via
