In a nutshell telepresence is a turbo-charged version of video-conference, that aspire to give you the feeling that you are really in the remote location. There are some companies around the world that invest loads of money in developing better and better telepresence experiences, because they believe it's going to be a billion-dollar market. Now, is there a better experience than seeing your remote pal in 3d across the table?
Obviously, ACME, the project featured in the above video, doesn't come close to making this idea a reality. But it does let you see you companion's avatar, which mimics his gestures, and share with him a virtual desktop.