I’m assuming it’s warfare as well (and FTL is very much included in that), simply because it’s the most glaring flaw in the game right now, especially after Utopia (not that Utopia made warfare worse, it’s just that it enhanced a lot of the empire building side of the game).
Paradox games have never had great warfare (outside Hearts of Iron) so I’m not expecting anything deep and tactical or anything, but there needs to be some way to create terrain, force battles, or slow down enemy fleets. Something needs to be done regarding doom stacks as well, which are dealt with very well in their other games already, via stacking penalties and attrition.
A lite supply mechanic might not hurt here, where you fleets get slower or wear down the further they are from friendly space. It doesn’t have to be as in depth as Hearts of Iron, but a fleet operation range attribute might be nice.
I’m definitely interested in seeing what they come up with. Right now, Stellaris is a game I have quite a bit of fun with for a game here and there, but it’s not like EU4 where I can play it over and over and over. A warfare/FTL overhaul would probably be what puts it over the top for me, assuming it’s done well.