At the Apple Worldwide Developers Conference (WWDC) 2012 Tim Cook launched the iOS 6.Various key features includes Facebook integration and a brand new Maps application. Even there will be improvements in Siri, FaceTime, and Safari as well. The most important feature that has been added is Apple's own navigation software that will replace Google Maps. This app will offer turn-by-turn, voice guided navigation with real-time traffic updates. But there is no information that whether it will guide you in offline mode too. FB has been integrated throughout the UI in this iOS 6. It has been reported that Facebook events and friend details will also be integrated into Calendar and Contacts and even ask Siri to post your updates. Siri will now comprehend more languages including Chinese, Japanese, and French with iOS 6. But it is not sure that Siri will follow accents. This feature will also be introduced in the new iPad. This virtual assistant Siri has the ability to answer queries regarding sports, dining, and everything under the sun.
Even Apple is working with car manufacturers to integrate Siri into select voice control systems. You will be able to ask Siri questions without taking your eyes off the road by using this voice command button on your steering wheel. iPhone 3GS, iPhone 4, iPhone 4S, iPad 2, new iPad, and 4th generation iPod Touch are the devices that are eligible for the new OS.
This product will be released later this year.

List of all iOS 6 features:

At Worldwide Developers Conference, San Fransisco, Apple launched the mobile device operating system iOS 6. Apple announced that there are more than 200 features and changes. Below is the list of the new features and changes.

Facebook:

• Single sign-on
• Share from Photos, Safari, Maps, App Store, iTunes, Game Center
• Public API for developers
• Contact and Calendar integration

Siri:

• Updated restaurant searches (type, price, Yelp reviews, distance, map, hours, phone number)
• OpenTable reservations for restaurants
• Movie listings per theatre
• Rotten Tomato movie reviews
• Movie trailers
• Search by actor/actress
• Movie facts
• Launch apps
• Send Tweet
• Update Facebook status
• Listen to notifications
• Eyes Free car integration (in the next year)
• International language and local search (Canada, Spain, Italy, Switzerland, Korean, Taiwan, Hong Kong, China)

Phone:

• Reply to incoming calls with message (preset or custom) or save reminder (timed or geofenced).
• Facebook and Twitter compose buttons.
• Notification Center: Do not disturb toggle with fine-grain phone call exceptions, schedules, or allowing repeat calls.

Safari:

• iCloud Tabs for Safari on other iOS devices and Macs
• Offline Reading List
• Smart App banners link to App Store or launches
• Photo uploads
• Full screen video in landscape

FaceTime:

• Available over cellular
• Apple ID unified with phone number, enabling FaceTime or iMessage answering on iPad or Mac

Photo Streams:

• Shared Photo Streams with designated friends, includes comments
• Photo Stream pictures in Mac screensaver
• Photo Stream now a separate tab, not another album

Passbook:

• Barcode collection for boarding passes, store cards, coupon, movie tickets
• Pops up on lock screen when you arrive
• Boarding passes update with gate changes
• Cute deletion animation
• Includes up-to-date-balance

Mail:

• VIPs - designated contacts cause notifications, e-mails flagged with stars, separate inbox
• Flagged mailbox
• Open password-protected Office docs
• Per account signatures
• Attach photos in-line
• Fun new pull-to-refresh animation

Guided Access:

• Disable certain app interactions with a circle
• Single-app mode
• Limit hardware buttons, touch, and motion control access

Game Center:

• Game Center sync with OS X
• Find Facebook friends
• Cross-platform turn-based and real-time gaming between iOS and Mac
• Issue challenges to friends

Maps:

• Local search with 100 million business listings with Yelp reviews and pictures
• Crowd-sourced traffic data with incident reports
• Siri integration, finds spots along your route
• Flyover (3D buildings)
• Multitouch rotation, angle change, and zoom
• Powered by TomTom
• Free turn-by-turn navigation with alternative route offers based on faster ETA
• Navigation viewable from lock screen
• Pinch-out in maps goes to globe view

Developer SDK:

• Audio and video sampling during playback
• Pass Kit
• Rich text on labels, fields, and text views
• VoiceOver gestures
• Control camera focus and exposure
• Remote Web Inspector
• CSS filters
• Action Sheer
• Web Audio API
• Cross fade with CSS animation
• Game Center in-app experience
• Reminders
• Video stabilization
• Game groups
• Bluetooth MAP support
• Auto layout
• State preservation
• Pull to refresh on Table views
• In-app purchase hosted content
• Read and write image metadata
• Collection views
• Transit apps
• In-app Bluetooth pairing
• Face detection API
• Inter-app audio
• Frame drop data
• Map Kit
• In-app content purchases
• Multi-route audio

Other:

• Location-based reminders for iPad
• Manual location entry for reminders
• Custom vibrations for alerts
• VoiceOver improvements
• App in Safari search results
• IPv6 support for Wi-Fi and LTE
• HDR improvements
• Auto correction for every keyboard
• Global network proxy for HTTP
• Manual reorder of reminders
• Lost Mode - send a phone number to lost device which can be called with single tap
• Kernel ASLR
• French, German, and Spanish dictionaries
• Word highlights for speak selection
• Search all fields in Contacts
• New iPad Clock app
• Improved keyboard layouts
• Made for iPhone hearing aids
• Top title bar changes color with app
• New dialler layout
• New iPod app
• Granular privacy control
• iCloud-stored user dictionary
• Updated sharing menu with large icons
• Music ringtones
• Redesigned App Store and iTunes
• iTunes Match now streams music (rather than just download)
• Top title bar changes color with app
• New iPod app layout
• Granular privacy control
• iCloud-stored user dictionary
• Updated sharing menu with large icons
• Music ringtones, alarms
• Redesigned App Store and iTunes (can now view App Store screenshots in full screen)
• iTunes Match now streams music (rather than just download)
• Support for iPhone 3GS and later; iPad 2 and later, iPod touch 4th gen)
• Tilt changes reflection on slider buttons
• Spotlight now shows which folder apps are in
• Government alerts (AMBER and Emergency) in Notifications
• More and new Emojis
• Music preview banner overlays current screen
• Time since last full charge (usage, standby)
• Darker camera UI
• "New" banner on app icons after installation
• Update history in App Store
• 15 second skip playback controls for podcasts
• Hold navigation arrow in Safari for iPhone for history view
• "Enhanced" photos now add "-fixed" to file name
• Cleared notifications sync across devices
• No more pop-up in Safari when there's no internet access available
• Share calendar that you created (but not one shared with you) from app

Source : Techtree