The iPhone 5 is only six months old, but a new iPhone is coming out and it gets the name iPhone 5S. It's still possible that Apple will skip the iPhone 5S and go direct to the iPhone 6. The iPhone 5S will be just like the core model but you got a better camera and the iPhone will be faster as the iPhone 5. Many people think that the iPhone 5S (or 6) will be released in the Spring 2013.
Still, nobody knows when it comes out. If the iPhone 5S is released, we'll let you know.