1) Yes, Physics system is there. Is it where it should be? No. But it's there, and much better than on last gen.
2) Running animations... better than last gen by far, yet still need overhauling.
3) YES. Especially in M15, QB's play a LOT differently than one another. RG3 will play so differently than Brady/Peyton. They focused on that.
4) Yes again. They do have signature throwing motions.