Incidentally, I've been using a multitouch gesture-recognition pad (from the now-defunct Fingerworks) for a while and while it still functions as a single pointer, even the extra abilities from gesture recognition make it a really nice, intuitive tool (basics, like click, drag, scroll, etc, of course--but also things like cutting/pasting/zooming/lots of others are possible too).
But yes, it should be about NEW interfaces. I'm STILL amazed that after years and years of mousing, no apps offer the possibilities of two mice, for example (really now--click your painting, then move the mouse over to the palette of buttons, then back... why not have two mice, one for buttons and one for action? Same goes for real-time strategy games, for example). So I'm pretty excited about new ideas as well, and the multitouch screen is a really neat idea.