It's essentially a do-ocracy in practice, though we have discussed the possibility of putting together a foundation to steward it, particularly if we start to get money involved. There are currently five people who have admin rights with respect to their various competencies, and anyone who establishes trust with the community and gets stuff done will also be promoted to their level of competence, as it were. Though I hesitate to describe it like this, I think of "admin" more as a clerical role than an authoritarian one. You're good at code review? Everyone generally trusts you? Then merge rights are just a tool to help you do your work better.

I don't think anyone is going to be very excited about introducing Rust unless there's a compelling reason to, but feel free to bring it up on the issue tracker for discussion and see if you can form a consensus on the matter with the rest of the community.