We have already heard about some of the features coming in OS X Mountain Lion, and now we have some more information on a new feature which looks very interesting, OS X AirPlay Mirroring.
The video below shows OS X AirPlay Mirroring in action on a HDTV, and
as you can see from the video you will be able to display your full OS X
desktop on your HTDV via an Apple TV device.
It certainly looks pretty cool from the video, the video was put together by the guys from Insanely Great Mac.
Source Mac Rumors