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.
The old Hailfire has been in the mod for almost 14 years now, so evilbobthebob has made some new assets for it.
A combination of modded graphics and a very nice new model made me think this was a 3D render for a good few seconds.