I think there's more than the original 10,000 + 30,000 invites. Google has a waiting list now that people have successfully been able to receive an invite. Additionally, I was able to get one through some contacts at Google, so I don't think there's any way to tell. Plus, after sending my 3 invites out in early December, none of my invites received an actual invite yet. Given the consumer one is supposed to be released first half of 2014, the appeal to spend $1500.00 bucks on the prototype is waning, IMHO.
Just a chick who really digs gadgets and things that go vroooom!