iOS 6 brings a major upgrade for Siri along with it, and she can now update you on sports scores and stats! Just in time for the Euro 2012. Siri is also now integrated with Yelp and OpenTable for food reviews, IMDB and Fandango for movie reviews and ticket bookings, and she's learning a whole bunch of new languages!
Also, iOS 6 has complete Facebook integration. Most useful? Birthdays and events from Facebook can now be directly synced to your phone calendar.