Ubuntu 13.04 (Raring Ringtail) is in full development and features are added every day, and now a video which demonstrates the capabilities of the operating system on huge touch screen display has surfaced.
In order to get the hardware questions out of the way, we have to specify that whoever made the video used a Multi-Touch 27" Lenovo Ideacentre A720 monitor.
The video is quite extensive and shows how Ubuntu 13.04 works on a multi-touchscreen display. This is probably what the developers from Canonical had in mind when they made the Unity icon so large.
It feels natural and everything works just the way it should. The only problems seem to affect the Close, Minimize and Maximize buttons which are still tailored for the mouse, and the use of Unity menus, for Gimp, which are hard to pinpoint with the fingers.