Kubernetes 1.5.4 and Rancher 1.6.2

Why is Kubernetes 1.6 not available ?
Also an upgrade is not possible.

Choose a version: only Kubernetes 1.5.4 ?
Is this normal?

It would be nice if they published something on the upgrade schedule.

I have two kubernetes environments now for testing. One on Google and the other on my local servers thru rancher. I am getting lots of errors in rancher kubernetes because my kubectl is newer:

» kubectl version --short
  Client Version: v1.7.0
  error: got '': unexpected end of JSON input

» kubectl version
  Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.0", GitCommit:"d3ada0119e776222f11ec7945e6d860061339aad", GitTreeState:"clean", BuildDate:"2017-06-29T23:15:59Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
  Server Version: version.Info{Major:"1", Minor:"5+", GitVersion:"v1.5.4-rancher1", GitCommit:"6ed2b64b2e1df9637661077d877a0483c58a6ae5", GitTreeState:"clean", BuildDate:"2017-03-17T16:58:04Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}

It’s just not supported yet. Next release will have Kubernetes 1.6 support.