My expectations are kinda low for this group: it's a lot of untried guys playing D and those that started in front of 'em last year weren't that successful. So, wait and see. The D only needs to improve 25% to give the O a chance to win a lot of games. But that may be a lot to ask. I have little doubt the current coaching crew will have made great strides once they get a couple of recruiting classes, but the challenge will be this year. 
Herbert better stay healthy--- and Foreman.