With those Galaxy Forge maps, do you have any plans to add extra systems? Just to extrapolate on the universe a bit more, and add some territory for factions like the Nomads and BHG to be able to put up a decent fight.
Add additional Omicron systems for the Nomads and Corsairs to fight over, along with the Dyson Sphere. I'm not quite sure how that could work, maybe see if you can get the outside sphere texture and apply it to a super oversized planet?
In Omega-5 (and I think Omega-41), you can see what appears to be the vortex of a black hole in the skybox. Maybe make an Omega system with that, thanks to the Stellar Phenomena Black Hole. Have interesting and very dangerous systems on the edge of known space, filled with resources for those brave enough to take them.
I should probably stop asking about stuff that's a long way off, shouldn't I?
What are your plans for the research trees? I imagine due to the Capital/Fighter weapon split, there would be restructuring of the weapon techs, at least. I was also thinking that maybe the Metal/H-Fuel costs of research be based on the type of research it is, like armor or hull techs would require large amounts of metal, and thruster, power and cruise speed upgrades would require lots of H-Fuel, etc. I'm not sure if that would balance well ingame, though.
If you haven't got anything specifc planned, I might try and draw up a crude research tree for Liberty, see what you think of it and all that. Let me know if there are any Liberty specific research things you plan to have in it, and I'll see if I can come up with something good.
