Docker Machine looks to be a revision/rebrand of your docker hosts proposal made in the last 1-2 days or so. Very confusing.

The proposal discussion: https://github.com/docker/docker/issues/8681

Rename "docker hosts" to "docker machines": https://github.com/bfirsh/docker/commit/e6abec4033f48d1cad31...

2 days ago, from you:

  I have now rebased the host management branch on top of #8265 and squashed it:
  https://github.com/bfirsh/docker/compare/host-management
  Any pull requests should now be based on top of that. The driver interface hasn't changed, so it should be a trivial matter to rebase any existing pull requests. The main thing which has changed is that drivers are expected to set up identity auth for communication with the host. See this commit for an example of how to do so.
  The old branch is here for reference.
  Full update and preview builds coming soon."

1 day ago, a message from tianon, core Docker maintainer:

  Has there been any progress on splitting the actual driver implementations out of the core binary?

And now this. Color me confused.