Microsoft is talking a lot about the importance of touch input to the Windows 8 experience in everything from tablets to high-end desktops. To show just how far you can go with touch, Microsoft demonstrated a PC running Windows 8 connected to an 82-inch touchscreen that can support up to 100 touch inputs (or 10 simultaneous users).
On the other hand, instructors use black/whiteboards etc, so there's a potential use case in education, or, in fact, when doing demonstrations or presentations, but I fail to see how Windows has much to do with that, as in the end application support is what matters more.
Of course, if that means that there is a decent multi-touch API integrated into Windows 8, this may be of some interest.
Still, a bit too flashy for my taste.