As was noted in some of the early iPhone 5s and iPhone 5c reviews, there's a small update to iOS 7 out there specifically for those devices. So, if you've picked up either new iPhone this morning, don't forget to head into the Software Update section in the Settings app, and snag it for yourselves. The update to iOS 7.0.1 is a pretty tiny 17.5MB in size, so it shouldn't take too long to get installed.
On the iPhone 5s, iOS 7.0.1 is known to address a bug with the new Touch ID system, in particular in relation to iTunes purchases. Officially it's labelled as "bug fixes and improvements," though we're not sure at this point what if anything it rectifies on the iPhone 5c.
If you notice anything changes post update, shout out in the comments below!