Good question. I'd like to know too.
Also, Matz has been very loyal to the core group of Ruby maintainers even after Ruby has gone beyond fad status. Matz has been reluctant to put Ruby on a distributed SCM as well.
I expect all of these issues to be resolved within the next few years...
Also, I don't really care if these community enhancements make it to the "proper" Ruby or not. The main thing is that it is available to the community, whether christened as the "Matz" Ruby or not.