"Adding k8s on mesos you get the next-generation cloud native scheduler and the ability to run existing workloads. by running k8s by itself you get a lightweight cluster environment for running next gen cloud native apps." @cmcluck

More references:

[1] https://mesosphere.com/blog/2015/04/22/making-kubernetes-a-f...

[2] http://blog.kubernetes.io/2015/04/kubernetes-and-mesosphere-...

[3] http://thenewstack.io/mesosphere-now-includes-kubernetes-for...