Which makes me unsure we will ever see one released externally, it must be the support cost that holds them back. Internally, they only have to support one distribution (their own) and some very smart users.
AFAICT Google internal Linux is pretty much a customized Ubuntu. If a Linux desktop client has a target market, users of Ubuntu + other Debian flavors represent most of it.
Which makes me unsure we will ever see one released externally, it must be the support cost that holds them back. Internally, they only have to support one distribution (their own) and some very smart users.