Star Wars Battlefront III Legacy (or: Swbf3: Legacy) is a large-scale conversion mod created for Battlefront II using as many Assets from the cancelled game as possible; including both eras (Clone Wars and GCW), a brand-new HUD+Interface and a few converted maps such as Coruscant and Cato Neimoidia.
Here you can download the Open Beta of Star Wars Battlefront III Legacy here: Moddb.com
Battlefront III Legacy - Open Beta adds one map, three game modes and one era to Swbf2. It contains Assets such as models, textures and sounds from the cancelled game: Star Wars Battlefront III.
You can play as a Clone Trooper, as General Grievous or as X2 and fly from ground up to space with your Republic Arc-170 Fighter.
The Beta will be available until the Final Release of the full mod. You can find more information about this mod by reading through the sites.