I think the trailers so far have given the audience a strong indication that CM's backstory will be told via flashbacks connected directly with her amnesia. I will be okay with it as long as her flashbacks are not disjointed like how it was presented in BvS--although admittedly I (meaning me only) was okay with how Snyder did flashbacks in MoS. For me, focus on the Kree will be central for me. Skrulls are the main antagonists but I hope we get a load of Kree background as movie filler. It should not be hard. The movie is set in the S.H.I.E.L.D. pre-Iron Man era. Any other focus should be on Fury himself I would think and that should not be a lot considering what Captain America: The Winter Soldier revealed about him.