The passenger missions look interesting with their side missions (I don't get the complaint that they are just haulage missions, I really don't know what people were expecting from the update on passengers this time around, but I didn't expect anymore than this).
SLFs will be an interesting distraction, but is far from core game play (at least until multi-crew), module storage is a nice addition, and on the instant transfer, well I agree that it doesn't sit well with the games physics, but frankly I'll use it so little that it is fairly irrelevant to me (and if it sells more copies then fine).
3D printed fighters, whatever, if you had to buy and carry them like SRVs then frankly they wouldn't be worth the cargo space/module loss.
I'm more interested in the geological improvements, QoL stuff (like the route planner), paint jobs and ship kits, and of course the improvements to the story (which may well include Aliens).