Nothing that isn't on the forums here. There is Parallel Universe though. Its not strict Priv canon like GG is. It adds more to the original privateer such as AI controlled turrets and more ships you can buy. You can also check out Vega Strike which is the engine that Gemini Gold is based on. Its a modern Elite/Privateer clone, but GG and PU use this engine.http://vegastrike.sourceforge.net
I'm working on trying to get something updated for GG but for now most of my focus has been on VS.