As far as I can tell:
He took a bunch of character skins.
He took a bunch of maps and arranged them into the 5 Episodes of the Saga.
He added bot scripting so the bots attack who they are supposed to.
He tweaked various aspects of the maps and characters.
He added new loading and such screens.
He integrated JediMod and Jetpack mod and "dual pistols" and lightsabers.
So the end result is say, you, as Obi-Wan, fight Darth Maul with Qui-Gon in Duel of the Fates and Maul has the double-blade and Qui-Gon doesn't attack you. And there's a bunch of levels like that.
It's looking good, at the very least I will be able to try it out and tell you all about it.