It's possible that the fingerprint scanner wasn't ready in time for the iPhone 5S and iPad 5, so it will be the next year's models that get it. Either that or Apple just got lucky that no one in China took a pic of that specific part...yet.
Of course that makes you wonder what Apple will use to primarily distinguish the 5S from the 5 (colors???).
Yeah I'm starting to wonder that myself...cus the 5 C is essentially getting all of the iPhone 5's internals. So besides the processor bump and camera bump...there's got to be something else. Form factor isn't changing. Maybe screen resolution??? I highly doubt IGZO has made it's way in there, but what else could they possibly add? iOS7 isn't even going to be exclusive