RE: Win 8 replacing Win 7...
If you use Google Maps without a touchscreen you're ready for Windows 8. Everyone using GMaps clicks and holds and drags and pans and zooms with their mouse already. The Metro UI will be the same. No need to have a touchscreen. Though I can imagine new LCDs with Kinect tech built into them. So you can do basic hand gestures to get around apps that take advantage of that.