Google AppEngine apps are automatically accessible via DNS at a predictable location (appname.appspot.com). Is the same true for Google Container Engine instances?
It's simple to give GKE instances a public IP, but this doesn't work well if you want to share demo links (without worrying that they'll change) or use Google OAuth (which does not allow static IPs as callback URLs).
I can register a domain and configure subdomains to point at the IP for each container engine instance using Google Cloud DNS. But it would be simpler if GKE did this already!