I think a finger based ui or an option to have stylus ui would be good. Why not please both crowds. All it would take is a config option. I think it should have multitouch screen. I have one of the now rare fingerworks multitouch gesture keyboards. The ability to use gestures is just fantastic. I know that people think the iphone and itouch are overrated on the gesture features and that may be, but being able to zoom cut copy paste with simple gestures is a big big plus for me.
The other thing I think would be useful is to have a slot on the back that can accept wifi/extension cards. Kind of like a minipci. Perhaps just a regular SD slot but one that can have room for an antenna. I would like the device that I use to be able to support whatever gives me the best coverage for internet be it sprints wimax or google broadband or verizon 700mhz.
IMO the form factor should stay the same or have multiples to choose from. Any bigger and it gets hard to pocket/becomes a laptop. NITs shouldn't be in competition with eeepcs
Isaac.S