It’s easy to be disappointed by the upcoming iOS version. There’s no massive new feature like the notification center which has been introduced in iOS 5. Yes, there may be a new Maps app, but it may well be that in the early stages it’ll be inferior to the current Maps application with map material by Google. Still, I think it’ll easily be the best iOS version.
I think iOS 6 will pretty much be the Mountain Lion of iOS. A refinement of something which is already good. There are useful new features like the “Do not disturb” function or the ability to share photo streams publicly. Apple is on the right course. Why desperately try to make something new when you have something solid, pretty and established.
Think about it this way: what are you missing? I for myself am totally satisfied with iOS and already love using iOS 6 on my test devices.