the ability to change cellular providers, and not be locked into Sprint. They have the worst coverage in my area, albeit some of the fastest data connections.

if the next gen device has WiMax, which is not 4G but really 3G, i would like to be able to get my cell service through my current provider and not a lock-in deal with Sprint.

maybe a 2-4 MegaPixel camera with zoom, flash and video capture as well.

a better, more power efficient bluetooth adapter with A2DP support.

both SD cards on the n800 have to included in the next device as well.

a wireless card that supports packet injection.

and of course more memory and CPU