I think we will see some 3-4 this season, but my only problem with it is that I really don't think our personel fits it perfectly.
First, one of our best defensive players is Kirksey and you would either have to take him out of the game (as Edwards would need to play the middle), or he would be playing a tad out of position. I am not 100% into the idea of running a ton of sets where one of our best (if not the best ) player on our defense isn't put in his best position to dominate.
Second, while we have LB depth, that depth isn't in the middle. My guess is that it would be Hill taking over the other ILB position. So essentially we'd be swapping out Hill (a pretty undersized LB) for a DT. I can't imagine that light lineup really being effective in Big 10 play. Had Maresh been able to stay on the squad (or next year with Beal), it would for sure be a possibility.
Lastly, we seem to have a lot of inexperienced yet talented rush ends (Garin, Wilhite, KGM). Those guys would either need to take some snaps as rush OLB in the 3-4 (ala Kevin Greene) or they would essentially be off the field, in favor of a DE pair of Jacobs and Hageman.
I do think it will be something that will be sprinkled in, but probably only in like nickle or nickel type sets or against spread teams.