not sure...I'd think it can, but I'd either ask the Apple store(if there is a local one near you) or buy one and find a friend who has one, and try to sync both of users to one of your macs (also can play with it)
I use a MacPro to sync 5 atv's. I stream 9 atv's from this MacPro. You can only sync 5 at a time. Using new Airport Extreme. It is incredible to play the same movie on 5 atv's at the same time and in different places within this same movie. Over five going at once starts stuttering/freezing.