A beta build of Star Wars Battlefront III for the Xbox 360 has been leaked to the internet by Reddit / Twitter use ProtoFaggot. This was a game very much wanted by the community, however ultimately canceled before release. It's worth mentioning this is not the same as the 2015 release.
The build number is 70217 which is quite playable on RGH hacked Xbox 360's with RGloader and on 360 devkits, however at a low framerate. The leaked build currently does not work on Jtag / RGH hacked Xbox 360's running Freeboot or the Xbox 360 emulator Xenia.