I`ve send G2 an email back in 2009 and wrote it here that I´ve did this.
Later I got a PM from a SimHQ member (he don`t want to make it public what he has written to me), but I think it`s ok to give that part of information away:
...I think you'll find that G2 only had a license to publish - not to release source. Razorworks and Empire are also defunct - the IP rests with an American concern - New World IP. They, in turn, have exclusively licensed the publishing rights to Zoo Publishing (also in the US, New York I believe) - including the important re-release rights and new developments on existing IP (which would give them community code access)...
Don`t know if this is current anymore or basicaly true. Maybe it can be of any help. I really would like to see community work on EE2 basis. EE is still unique with it`s features.
Just found the developers of EE2: http://www.gameyus.com/onamaEN.html
(sure they can`t publish the source, but...)