Any rumours of a commercial version being produced? I know its a great DIY project, but I have trouble with the D and the Y parts.

Nothing I've heard so far.

Being GPLv3-protected, the Gray-Hoverman design is available to be commercialized with the critical proviso that any and all changes to the design must be contributed back to the project, which can be done by submitting the changes to this thread with supporting documentation.