SiriÂ
You can call it the second generation Siri with new and improved features. It now has full support for American sports according to the demo at the keynote.  It can  list game times, scores as well as player standings. It is now been integrated with Yelp reviews for restaurants as well as things like a rating and average pricing. You can even use Yelp to make reservations.
Movie database has now been added to  give you movie listings, trailers and details on different actors.  Apps can also be launched by Siri.  Eyes free tech and car partnerships with the likes of BMW mean you don’t even need to touch your iPhone to activate Siri, you can do it from your steering wheel.  Siri has also been added to  the new iPad, a big improvement from the basic voice dictation.
Facebook integration
Facebook has now been integrated just like Twitter with a new option in the settings menu to download Facebook and enter log in details. Â you will be able to use Facebook seamlessly just like the way you can with Twitter.
The Phone app
You now have two options when your phone is ringing, you can chose to be reminded about the call later just like the Any.do app and also yuo can simply reply with a message to let called know you will call them back if you were busy.
Do Not Disturb
Do not disturb feature will make sure your phone stays quiet when you do not want to be disturbed by notifications and the like.
FaceTime
FaceTime has now been allowed over 3G, a feature that has been available in the Jailbreak community for a long time, so no need for just Wifi.
Safari
safari now has icloud tab syncing with OS X, so you can browse on your computer and then move to your iPhone where the same website will be open.  The offline reading list is a feature which lets you download and store articles from the web to read later. Particularly useful in areas without any data reception. You’ll also now be able to easily upload photos.
Photo Stream
Apple has added the ability to collaborate and share pictures with friends; shared streams let you invite friends to look at your snaps in the cloud.
Smart App Banners
Developers will be able to suggest their app when you visit their website with a new feature called Smart App Banners or if you have already downloaded the app, the page automatically pushes you into the app seamlessly.
Mail and VIPs
The new VIP option will let you separate the junk from the important messages so that you don’t have to sieve through all your emails; yuo can select those VIP and receive all their messages in the VIP box.  You now also have the pull to refresh option, another feature that has been used by the Jailbreak community for a while now.
Passbook
Passbook lets you store all your tickets and QR codes in one place, coupon vouchers, Store cards info and boarding pass. Â I can see this one been integrated with NFC technology in the near future.
Guided Access
Apple has added new functions for those with disabilities which let you control certain functions of iOS.
- ability to lock up certain parts of the screen so that those who are blind don’t accidentally exit out of an app.
- single app mode, which will stop you from exiting an application.
Maps
Addition of option called Flyover which is  a realistic 3D views for the maps application,  using vector graphics to display a very smooth 3D interpretation of the map.  This won’t be available to the iPhone 4.
There is also the addition of  turn-by-turn navigation directions,  information cards listed on local businesses,  traffic service and Siri also now integrated with Maps, so you can ask for directions and POIs.
