I'll chime in my biggest concerns and we can roll from there
1) I've been waiting for a GOOD bluetooth support for phones, nothing so far has worked well for windows mobile phones especially on CDMA. - realistic, maybe not, but thats a huge want for me and others I'm sure.
2) The ability to use iGuidance, map monkey, map point, etc, easily and well integrated. I know its available in some FE's already, but its a classic must have.
3) Quick one-touch access to turning on and off night skin and/or the updating the skin automatically based on GPS time.