I'm the project owner of M3GE project. I'm late, sorry.
Well, the project uses the jsr 184 spec to create a mobile 3d game engine. Now the project is small, but already has player movement, fire action, collision detection and an implementation of a Wavefront file loader (used when m3g don't is supported by other design tools).
> These appear to be products from a commercial indevour
No, I'm using JSR 184 spec to make a 3G game engine for mobiles. I used JSR 184 RI to test it.
> Does the developer intend to release source code to this community?
The code are already in project CVS.
> Is JSR-184 really a game technology?
No, it is a 3D API. In most cases it uses OpenGL ES spec.