It appears in OS X Mountain Lion, there is an option to add an “Airplay Device”. This as never been available in previous versions. We are assuming that this option will create a way to allow iOS devices and other Macs to stream content TO a Mac.
Currently this button does not function at all when selected but we expect it to work in later developer releases. This option will bring a new opportunity to share music to other locations.
We are not sure if this option will support any video content but it is very likely that it will recieve audio content and be available in the later releases of OS X 10.8 Mountain Lion.