iOS 6 is now available

This information is provided by Apple:

This update contains over 200 new features, including the following:

• Maps
• Apple-designed, vector-based maps
• Turn-by-turn navigation with spoken directions on iPhone 5, iPhone 4S, iPad Wi-Fi + Cellular (2nd and 3rd generation)
• Real-time traffic information
• Flyover for photo-realistic, interactive 3D views of major metropolitan areas on iPhone 5, iPhone 4S, iPad (3rd generation) and iPod touch (5th generation)
• Local search results with Yelp photos, ratings, reviews and available deals
• Siri integration for requesting directions and finding places along a route
• Siri improvements
• Sport: scores, player stats, game schedules, teamsheets and league standings for American football, baseball, basketball, football and ice hockey
• Films: trailers, showtimes, reviews and facts
• Restaurants: reservations, reviews, photos and information
• Send a Tweet
• Post on Facebook
• App launch
• Eyes Free in supported cars
• Local search available in Siri-supported countries (availability may be limited during initial rollout)
• Additional country and language support for Canada (English and Canadian French), China (Mandarin), Hong Kong (Cantonese), Italy (Italian), Korea (Korean), Mexico (Spanish), Spain (Spanish), Switzerland (Italian, French, German), Taiwan (Mandarin), US (Spanish)
• Supported on iPhone 5, iPhone 4S, iPad (3rd generation) and iPod touch (5th generation)
• Facebook integration
• Single sign-on from Settings
• Post from Photos, Safari, Maps, App Store, iTunes, Game Center, Notification Centre and Siri
• Add location and choose audience for any post
• View up-to-date Facebook profile photos and contact information in Contacts
• View Facebook events and birthdays in Calendar
• Like content and see your friends' Likes in App Store and iTunes Store
• Shared Photo Streams
• Share selected photos with the people you choose
• Friends can view shared photos in Photos app, iPhoto and Apple TV
• Friends can like and make comments on individual photos 
• Passbook
• One place for boarding passes, store cards, film tickets and other passes
• Barcode display for boarding flights, buying coffee, getting into films and other actions
• Passes displayed on Lock Screen based on time or location
• Passes can be automatically updated
• Supported on iPhone and iPod touch
• FaceTime improvements
• FaceTime over mobile network support for iPhone 5, iPhone 4S and iPad Wi-Fi + Cellular (3rd generation)
• Receive FaceTime calls, sent to your iPhone number, on your iPad and iPod touch
• Phone improvements
• Do Not Disturb to suppress incoming calls and notifications
• 'Reply with message' option when declining a call
• 'Remind me later' option based on time or location when declining a call
• Mail improvements
• VIP mailbox to quickly access mail from important people
• Flagged email mailbox
• Insert photos and videos when composing email
• Open password-protected Office docs
• Pull down to refresh mailboxes
• Per-account signatures
• Safari improvements
• iCloud tabs to see open pages on all your devices
• Offline Reading List
• Photo upload support
• Full-screen landscape view on iPhone and iPod touch
• Smart app banners
• JavaScript performance improvements
• App Store and iTunes Store improvements
• Updated store design
• iTunes Preview history
• Complete my series
• Complete my album
• Game Center improvements
• Challenge friends to beat high scores and achievements
• Post high scores and achievements to Facebook and Twitter
• Friend recommendations based on your Facebook friends
• Accessibility improvements
• Guided Access to limit device to one app or restrict touch input on certain areas of the screen
• VoiceOver integration with Maps, AssistiveTouch and Zoom
• Support for Made for iPhone Hearing Aids for iPhone 5 and iPhone 4S
• Improved privacy controls for Contacts, Calendars, Reminders, Photos and data shared over Bluetooth
• Reminders can be reordered in the Reminders app
• Custom vibrations for alerts on iPhone
• Clock app for iPad
• Clock alarm with song
• Search all fields in Contacts
• Automatic film mode for improved video sound quality
• Definitions of a selected word for Chinese, French, German and Spanish
• New keyboard layouts for French, German, Turkish, Catalan, Arabic and Icelandic
• Keyboard shortcuts shared across devices via iCloud
• Bluetooth MAP support
• Global network proxy for HTTP
• Features for China
• Baidu web search
• Sina Weibo integration
• Share videos to Tudou
• Share videos to Youku
• Improved text input for handwriting and Pinyin
• Bug fixes

Some features may not be available in all countries or all areas. Please visit this website for more details:

http://www.apple.com/ios/feature-availability