Apple won't be making any radical changes to the iPhone with this year's model, if new photos out of China are to be believed. Purporting to show the iPhone 5 and new iPhone 5S' front panels side by side, this apparent leak shows they're almost exactly the same.
Spotted by AppleInsider on a Chinese-based blog called FanaticFone, the images could certainly be fake, or not what they claim to be, but it would be a very elaborate hoax. They're very detailed, high-res, professionally taken photos, and tally with blurrier pics spotted earlier this week by MacRumors.
Assuming they're genuine, they show the same design and measurements on both iPhones. Apple's policy since the 3GS has been to upgrade the innards but leave the chassis pretty much the same for the S model every other year.
The only differences I can see are the length and shape of the screen cable -- the bit sticking out the top above -- which ferries data to and from the screen to the processor, and the plastic bits that clip the screen to the rest of the chassis.