Talking about fantasy-realm changes...
I would love to see more abilities packaged into ships instead of on upgrades. Minimal upgrade system. I know it'll never happen because FFG loves their tiny cards.
And maybe a system of firing arcs that makes a little more sense. On an ISD, 12:00 should be the most dangerous zone, not 10:00 and 2:00.
Realistically...
More frequent communication from FFG.
More local players.
A really high value batrep YouTube channel.
More campaign play.