While I agree with obsidian on the notion that TOW doesn't need to be an open world game like TES games. I would prefer a few extra main planets and some more minor asteroids, and space stations.
And a few more distinct biomes on these planets. Seeing how each planet can have multiple landing spots, why not have them in different climates on that planet.
Also, a plant lab on a space station is always a classic location in scifi games
I guess this will be for the sequel