When talking about 'how wide open' an offense is, the answer can be very subject to interpretation.
Are you talking about:
-play selection of run vs pass
-number of exotic plays run
-formations: +/- a fullback, multiple WR sets, QB under center or in shotgun
-about how explosive an offense is with number of big plays.
As far as the Hawkeyes go, I think we can expect more of the same. This coaching staff is much closer philosophically to '3 yds and a cloud of dust' than they are to 'the greatest show on turf' or 'basketball on grass.'
I would not be expecting a 'wildcat' offense or a high percentage of plays with the QB in shotgun. I think they will continue to employ a FB and multiple TE sets as much as anyone.
As far as play selection goes, this offense is set up to be balanced. The 2009 Hawkeyes had a run
ass ratio of 1.16. That is actually the median number for the Hawks since 2001. The mean ratio is 1.34 over the last 9 seasons. Compare that to a school like Tx Tech where the run
ass ratio the last 2 years has averaged 0.49.
What is interesting is that the 4 highest scoring years since Kirk turned it around in 2001 have been (in order): 2002, 2008, 2003, 2001. The run: pass ratio in those year: 1.76, 1.61, 1.67, and 1.49. Those are the 4 highest ratios in the time span. To me that suggests that success for this offense correlates with giving the opposition a heavy dose of the running game.
As far as explosiveness goes, I think that is more a function of the players on the field than of 'being wide open'. An athletic WR can turn a 6 yd. slant into a 80yd TD and an explosive back can take a seam off tackle to the house just as well as can be done with a 5 WR, trips right set or a team in the Wildcat.