Any "fittings" involved in kegging are going to be quick disconnect. There will be one at the end of the line coming from the CO2 tank that connects to the "in" nozzle on the corny, and there will be one on the beginning of the beer line that connects to the "out" nozzle of the corny. These fittings are similar to fittings on the end of an air compressor line where you pull a sleeve to release/attach the hose to an air wrench/nail gun, etc. When changing your keg, all you will have to do is pop the two connectors off and pull the keg out.
Edit, just saw your post: yes the the posts on the actual keg are designed for quick disconnect fittings