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LTE ROCKS! One of the primary reasons I traded away my iPhone 4S was the 1 Mbps download speeds I was seeing on Verizon's network. The LTE network is extremely refreshing and as you can see in the screenshot I am seeing speeds faster than my home cable Internet connection.
I used Siri on the iPhone 4S primarily to create reminders, but am already using it quite a bit more on the iPhone 5 for checking sports scores, launching apps, checking movie times, making appointments and reminders, mapping, and more. I still like the way Google Now works proactively to provide your latest information, but Siri is a LOT better than it was in iOS 5.
Reject call with SMS: I know we had this on other platforms before, Symbian a long time ago, but it is still great to see it finally come to the iPhone. I don't mind if Apple copies functions and makes things better so this simple utility is quite handy.