Now as iPhone has arrived, mobile accessory manufacturers have already started making (or at least working) on iPhone 5 accessories. The faster one is the sticker for iPhone 4 and iPhone 4S. Which turns iPhone 4/4S into iPhone 5, just in terms of looks. This may look quite funny but is a nicer and cheaper way of owning an iPhone 5 with smaller screen.
At least you can fool your less tech-savvy friends with the help of a sticker 😉