Wow, I can't believe I'm the first to post on this one! (If someone doesn't beat me while I'm writing this!!)
For me, WM7 should:
- Have a great browser
- Have greatly updated Outlook Mobile (especially the Messaging client)
- Be more finger friendly, but not to the extent of getting rid of the stylus! And not to the extent of abandoning the physical buttons (as HTC is trying to do now!)
- Boot faster!
- Be more stable than any WM version before!