If you watch the press conference he went beyond 4-3. He indicated he would like a great pass rusher, and two shut down corners. He went on to say we will stop the run. He can live with getting beat by a pass, but not by the run. This sounds like a David Gibbs defense.
On offense he likes a QB who can run. They will go 2 back and run down hill, they will use speed option, and a spread option. No wonder Gray was all smiles.