Realistic expectations would be:
better conditioned athletes, leaner on both lines
stronger athletes
more physical play
tremendously more intense, focused play
gang tackling
improved fundamentals getting off blocks, better leverage with lineman, etc.
smarter decision making from coaches
coaches who play speed players
better use of redshirts
no excuses made by coaches or players
no blame being attributed to anyone but those responsble
a never quit attitude from coaches and players
no talking smack from players
good graduation rates
excellent character from the players and coaches off the field
better connection with team history, ex-players
and whatever that translates to record-wise on the field. Everything listed above is in the control of the players and coaches. Expect them to do all of that and hope it translates to more W's than L's --- maybe appreciably more W's than L's. But remember that the B12 now is pretty good --- even with all the improvement listed above, 9 wins may not happen.