While you can’t get your hands on Apple’s latest iPhone, savvy merchants are already moving now to expand their offerings to include accessories for the new, larger form factor.
Case in point- my friends at MobileFun (UK or US) have already announced their first accessory specifically for the iPhone 5. The SGP iPhone 5 Screen Protector is a different from the typical smartphone screen protectors widely available. Most are single-use plastic or resin sheets that adhere to your screen, where the SGP screen protector is chemically reinforced glass. The protector is a scant 0.4 mm thick, so it doesn’t noticeably increase the thickness or profile of your device, yet it offers superb protection from scratches and abrasions. The SGP protector has similar oleophobic (oil shunning) attributes as the glass it covers, helping to reduce smudges and streaks. The glass is shatter proof as well; should it be struck with enough force it will crack but like automobile windshields it will retain it’s shape. Best of all, unlike plastic protectors it can be applied without annoying bubbles. I’ve used this type of screen protector for my current iPhone 4 and have been pleased with it with one negative observation; it isn’t compatible with all cases. It worked perfectly with my BookBook case, but wasn’t ideal when I switched to a CM4 iPhone Case Wallet. 
MobileFun expects to expand on their line of dedicated iPhone 5 cases and accessories to go along with their existing lineup of universal smartphone accessories. If you’re looking for something to complete your phone or tablet give MobileFun a look, chances are they’ll have whatever you need.
UPDATE: As suspected, it didn’t take long- MobileFun has already notified me that they’ve received their first shipments of iPhone 5 cases- specifically some leather cases from SGP, the same manufacturer as the aforementioned screen protector. The cases confirm what was already suspected; the iPhone 5 will be slightly longer/taller but the same width as the iPhone 4/4s. They even included a hastily-taken snapshot:
