With all of the new graphics processing and updates to the cockpits including shadows and sun glare effects, you can expect flight to "feel" new, but they pretty much have the flight models the way they are.
Not sure what they would have to change.... damage model for certain aircraft ... might be something to strive for .... but these sort of things usually come with updates of the plane model itself. So far only one plane was remodeled IIRC.