I actually had something like a NG+ in the initial draft of my 2367: Supernova campsign which is based upon the rank progression you have in the game.
Second playthrough would begin in the same role the first one ends, as a squadron leader where you have another view on the missions, as you would have to command other wings to fulfill their mission objectives.
During the second playthrough the player would reach a rank where he will actually command his wings from a cruiser and would have another role then.
The third playthrough would be the campaign in a cruiser role.
So the game and its missions would be more tactical in every successive playthrough.
Unfortunately the project is in development hell right now due to personal life
, even most of its missions for at least a first playthrough are finished, some of them still even have parts of the NG+.
But I have to admit that I think that the development of a New Game+ was always a waste of time in the gaming industry, as all statistics tell, that only a very small amount of players are finishing a game even once.
This is not applicable for a Fan-Community of course, but I also still not see that a NG+ mode would be played very much by players.
So I still think on my end, that a NG+ will be most likely dropped completely.