Gekido has just announced that there were 2 developers, including him, working on the engine in December 2010. At that point they were both sacked and as far as he can tell, the engine has basically been abandoned. So it looks as though it's the end of the road for GameCore.

Which is a shame as the engine, or at least the editor tools are excellent. I got got further with it than any other engine I've tried. It's just undermined by a general lack of resources and funding really. I've been forced to move onto another engine, trying them all out which makes me appreciate GameCore more actually. I could just jump into GameCore no problem, other engines are messy and unfriendly in comparison, especially UDK. I've moved onto Torque myself, Unity never really clicked with me.