As an avid Apple fan I try and update my hardware every few years or so. I bought the iPhone 4 on launch day as the retina display was too good to miss. While the iPhone 5 hasn't been officially announced I just don't see what the killer feature is going to be this time. Also if the leaked shots are anything to go by i'm not impressed by the case or the 4 inch screen. What do we think the killer feature will be this time that will make you buy it on launch day?