According to various tech sites, the new iPhone 5S will use the similar processor but features upgraded PowerVR SGX 554MP4 graphics, 2GB of RAM, a 12 MP camera, a dual LED flash, and support for 4G LTE-Advanced networks.
iGZO show for power saving and better picture quality and new 12 megapixel backside camera with flash. Nevertheless, retina remains 4-inches (1136x640) in size.
Moreover, in new iPhone 5S there is another feature added by Apple - fingerprint scanning and NFC support.
Have a look at the image below.