This could be a whole new metaphor for computing. It would entail a large amount of work in reprogramming (or a system level OS re-design) but if all menus and selection items pop up on the glass trackpad, no more mousing around to make selections, choose options, pick menus - then think of the gesture control available to supplement regular trackpad activity - this would be worth far more than a "MacTouch" or whatever tablet you were considering. You can then use the glass trackpad for forms input, signing docuemnts, etc. I sure hope this is in the works. 🙂
As developers start to fine tune for the glasspad, all kinds of UI changes can be made on thefly, and customized menus become an easy inclusion.