Thrawn's Revenge is a large-scale mod for Empire at War: Forces of Corruption. It includes the events of the Galactic Civil War after Palpatine's death at Endor, up until the signing of the Pellaeon-Gavrisom treaty. If you own the Steam version of EaW, you will have to complete extra steps to run the mod after installation. Please see the manual for these steps.
With the final changes for the 2.2.5 patch in testing, we've started moving into production on 2.3 in the developer builds. A lot of the changes we're focusing on will be to improve upon and flesh out what's there (including increasing the diversity between existing factions, and more specialized roles for existing ships), but there will be a new, ninth playable faction joining in the fray- the Corporate Sector Authority. We should have a new post covering who they are and what else you can expect from 2.3 fairly soon.