1- Player Corporation for the online mode with all the tools (contract/missions/tax/hangars) and a Chat that works!!!
2 - Better Trading GUI, more data, and when I fly, I want to have brackets on all the stuff that flies in space.
3 - Build all the stuff that can be traded so that market is player driven
4 - New ship fitting screen where you can change all the parts in your ship, and test the energy consumption so that you can tune your priorities (that will stop you from going cold in space when you activate your guns and feel very silly).
5 - Player hangars were I can dump my stuff.
Go back to Eve Online? Eve is what you want.