Version 22 of Astra Imperia is now available on dtrpg.com. If you have previously purchased it, you should have already gotten notice of the updated file.
Most of the changes have been balance issues. A couple of new mechanics, most notably Political Capital. Political Capital, or PC allows the player to affect diplomacy rolls in their favor. It accrues over time and once spent it is gone.
In the next few days I will be starting a test campaign. There will be some (a lot) of prep work for it, so that will be my focus at first.