Working closely with Facebook to create the best Facebook integration -- post pictures from photos, sites from safari, locations from Maps, etc.
The API is public so developers can also leverage the integration into their own apps, and of course it works with Siri.
Facebook integration also coming to the app store so you can LIKE Your favorite apps.
Support for contact signing.
Facebook integration also cming to the Mac in Mountain Loon.
Enhancements to the Phone app in iOS 6: New control for incoming calls. Reply with message or Remind Me later.
"Cant talk right now I'll"
Also a new Do Not Disturb toggle mode -- will mode any push notifications and prevent the screen from coming on.
With iOS 6, your phone number and apple id are unified.
So you can answer a call on your iPad or Mac.
Showing off iCloud tabs feature seen earlier on Mountain Lion.
Photo uploads from within Safari.
New: Smart App Banners -- if a user visits a developers website, the feature will inform the user of the developers iOS app available in the App Store.
Smart App Banners can also inform the newly downloaded App what the user was doing on the developers website so they can pick up in the app where they left off on the website.
Full-screen landscape support for Safari on iPhone.
Next: Photo Streams: shared photo streams allows access restrictions for your photos and friends.
Mail enhancements: VIP marker allows you to flag incoming mails from specific people and have notifications show up for those mails on the lock screen.
Support for opening password protected docs in Mail, Flagged Mailboxes, and easier inclusion of photos and videos into messages.