Ive only just bought the Canon 7d my initial "list" of improvement for a a 7d MKII would be the following:-
Slightly increased MP count to 20 - 22MP
Second CF card slot or SDHC slot for recording JPEGS at same time as RAW to different cards
Twin DIGIC 5 for faster readout to cope with increased MP
A break from the Pro series cameras by adding articulating screen
and thats it.