First of all, I want to say I really liked Hafley's press conference. He seems very real and said all the right things about using players based on strengths and weaknesses. Definitely seems like an Xs and Os guy
Personally these are the moves I would make:
Bak release is a no brainer.
Jones extension or restructure is a no brainer. You can't release him. He is too valuable to this offense right now.
Campbell should be released. He is not a fit for this D, IMO. He is slowing down fast.
Preston Smith you have to keep for depth at end. And he is not costing a ton for his production.
The only FA I might look at would be Safety. Geno Stone would be great as long as he doesn't break the bank.
Then it's just drafting possibly a Safety, a CB, and a LB. If we can get a LT, OG, and a RB great but my biggest needs are S, CB, and LB.