I do believe that the iPhone 4s is not the iPhone 5.. its just a slightly modified iPhone 4s , and that the iPhone 5 will be out in spring 2012 from what i read and hear.
iPhones are good but also terrible at times, they can have a lot of problems i know people who's phones overheat in regular weather, in fact i have never even heard of phones overheating other then the iphone lol.. but its still among the best smart phones out there