Any idea when these will be available for GKE users? I would love to spin up a node pool to compare but it seems unavailable:

  $ gcloud container node-pools create skylake --cluster montana --image-type gci --machine-type n1-standard-4 --zone us-central1-b --min-cpu-platform "Intel Skylake"
  ERROR: (gcloud.container.node-pools.create) unrecognized 
  arguments:
    --min-cpu-platform
    Intel Skylake