We hear this conversation quite a bit. Kubernetes is not a competitor to Deis. Kubernetes is a container cluster manager; a scheduler, if you will. You give it a container and some desired state and it will schedule it out to a cluster of nodes. Deis utilizes schedulers to deploy apps. We currently support Fleet at the moment but we have attended a few mesos hackathons to get a PoC working with Deis as well as kubernetes. If you have a use case, we'd be happy to hear it in the mailing list or in a github issue as a proposal :)