The docks appear to be identical in design, each with a Lightning-in and audio-out connections on the back, with an up-facing Lightning-in connector on front.
Each dock behaves as docks are wont to do, allowing you to charge, sync, play music, as well as conduct speaker phone calls while your iPhone rests in its cradle.
According to Apple's site, the 5S dock is compatible with the iPhone 5 and iPhone 5S, while the 5C's dock is only compatible with the 5C. Not too surprising, given each phone's small dimensional differences, but really? Couldn't Apple have been made a single dock, compatible with both new phones?
The docks will likely go on sale Friday, September 13; the same day the new iPhones hit the market. The docks will retail for $29.