Can I upgrade my iPhone 4S to an iPhone 5 after a 1 year contact with at&t?

I have an iPhone 4S and I wanna upgrade it to an iPhone 5 on this christmas after my 1 year contact with at&t. I just wanna know if I wanna upgrade it after a 1 year do I have to pay the full price for the iPhone 5 or just the $200?

Of course you have to pay full price. They're not going to renew your contract barely half way through.