So, we have the main game, which had a lot of depth in managing ships, assembling balanced armadas, and leveling capital ships. Then we have Entrenchment, which adds to the effectiveness of defenses and puts in starbases, which allow you to hold stars and other objectives that you used to either leave garrison fleets or leave alone.Next, Diplomacy will add in, well, extended Diplomacy options through Envoy ships, etc. What's left? I expect Invasion will be the next expansion pack, and it will bring in a host of new planetary abilities, as well as ground forces.