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.
While not a massive change (or the most visually interesting picture ion the world), I've started going through and adjusting some of the stats on fighters using translations of numbers from other sources, especially the X-Wing miniature game and other RPG sourcebooks. Here's a quick look at what some of the upcoming fighter stats are for ICW2.3, FotR 0.5 and some other stuff. A few are missing since I only took one screenshot and it's a pretty long list.