The concept as much as what strikes me is the Lockscreen and Notification Center. Beginning with the Lockscreen, would be interesting to have several topics to choose from and you can adjust the transparency of it to get the background color scheme we chose. The Notification Center will not completely kill me, but I assure you that when you change the widgets tab, this looks very attractive.
The Contacts application with these gestures are super sharp, it would be great to see Apple come up with something similar at some point.
Apple will unveil the iOS 7 on June 10 at the WWDC 13, Moscone West Heart in San Francisco.