ClusterHQ and Weaveworks are proud to have worked closely with the Docker core team to deliver plugins functionality in Docker engine, which is now available in the experimental channel of Docker.
Try the demo yourself using Vagrant and VirtualBoxPrerequisites: Vagrant 1.7.2
$ git clone https://github.com/plugins-demo-2015/demo$ cd demo$ make -C vagrantrunner
Warning: the Vagrant box is 1.3GB.
Then follow the instructions in the README.
We'll be watching the GitHub repo.