I have had a Windows 7 touchscreen laptop for 2 years. Windows 8 is very focused on touch. It seems like a good time to consider adding in design consideration for this touch world we are entering. Not sure if this can be implemented as a theme, to prevent non-touch users from having huge text blocks, etc.
I would argue it makes sense to implement, the trick comes in handling copy/paste, drag/drop and scrolling.
And you will likely need to tie into existing touch libraries of course. As opposed to designing your own.