What i personally expect from win 9: 
1) NTFS with real sym and hardlinks, no registry crap.
2) Global menu bar option  for applications insode panels  ( main menubar inside panel)
3) a grey theme design with nice borders for buttons 
4) a launcher/start dock with opened apps on the right or bottom side.
5) a desktop icon / fences like  full screen start menu woth real icons 
6) nicer and rounder  min max close buttons.
7) wine integration into the system:  https://www.winehq.org  ( yes the windows emulator schould also be integrated to win7 with a patch ( really necessary) !!!)
8) the new metro ui apps windowed with menu and toolbar.
If microsoft implement these 8 points in their systems i would buy it. if not win 7 is enough for me.
regards bluedxca93