I'm really doubting this as at a desk, no one wants to sit close enough to comfortably make gestures on a 22-inch screen. That would be about 2ft away, waayyy too close to view without eye stress. Besides, a mouse is much more precise within desktop applications. I realize that touchscreen versions of apps could be made, but this really rings false to me.
Besides, fingers never worked well with glossy screens (much less slick plastic Apple mice).