Mesos and Kubernetes are not really competitors, in so far as Kubernetes is more than just a scheduler and there is a partial implementation and work ongoing to get Mesos plugged in as a scheduler for Kubernetes: https://github.com/kubernetes/kubernetes/blob/master/docs/ge...

I'm hoping that Red Hat's two Kubernetes based products will help kickstart adoption. Red Hat Atomic Enterprise Platform is basically hardened and supported Kubernetes (https://github.com/projectatomic/atomic-enterprise) and OpenShift v3 is a PaaS built on top of Kubernetes (https://www.openshift.org/).

Disclaimer, I work for Red Hat. But any way, Kubernetes is awesome and could change the way data centers are run.