A Kickstarter campaign was just launched (and promptly funded) for the newest and final expansion for Exodus: Proxima Centauri. It works both with and without the Edge of Extinction expansion.
The stocks of some pledge levels are limited, so if you want to grab them, go here
, and support Event Horizon.
There's also an option to get an Upgrade Pack for your first printing of Exodus: Proxima Centauri.