backup and restore text messages ios 5 to ios6
I'm going to be upgrading my phone to the iPhone 5 when it comes out on Sept 21. Currently I have the 4s with iOS5. I was wondering if there is a way to transfer all my text messages over to the iPhone 5 on the iOS6. I know that you can do a restore through iTunes but wasn't sure what would happen since i'm using two different operating syatems now.
Thanks
iPhone 4S, iOS 5.1.1