In short :
Really take into account the ship components for your performances.
Add more weight to most ships (especially the medium and above).
Add momentum (so need to counter thrust to stop for instance).
Taking into account main thrust over the rest, so human ships will be good in straight lines but "bad" at turning while alien ships would be better at turning and strafing (basically trying to make the Khartu-Al relevant in combat).
Taking into account air thickness for athmospheric flight so plane like ship would behave like planes and brick like ships would behave like bricks and consume much more fuel to stay in the air.
Augment the time to kill.
That's the gist of what i know about it.
To add to this the new flight experience is going to be a lot more dependent on the particular ship you are flying. Ship values are going to WYSIWYG in relation to that, like the Gladius being a better maneuvering fighter with larger MAV/Main ratio whereas the Hornet with its much larger main engine will be better suited for straight line acceleration. Reverse values will be also dependent of forward thruster size too, where something like the Saber or Vanguard with large reverse engines will be better equipped to arrest motion. Hovering and VTOL capabilities will also be dependent on on ship configuration, some ships being better equipped to hover wile other can only do so being flat, they said a Gladius nose down will not be able to maintain altitude in atmosphere.
The other big change is going to be the removal of the afterburner cruise present where it's going to be manual setting where you choose to throttle up into those speeds. The faster you are going the less maneuverability you will have, turning dogfights will occur in lower speeds. This will be an advantage for larger ship because they will not be depend on maneuvering whereas smaller ships will want to engage at lower speeds to utilize their maneuverability.
The last part will be the changes to gunnery and aiming which they haven't talked about yet but said is coming.
Ok i've barely touched the game since the beginning and i think i will try it now just to see how this is coming together. What is the best way to experience the game controls wise , Hotas + KB or mouse KB ?
Right now it is still M&K, and to be honest until they make the changes to flight next spring I don't recommend playing much with the flight model besides going to point A and B.