I assumed what you did, but looking closer, this is definitely the real deal, complete with the Google-patched 2.6.30 kernel.

What I find interesting here is that ChromeOS has its own window manager for X. I was under the impression that the video system was something new. Does this mean that they still support X running on their own video subsystem?

I predict that someone will start releasing self-compiled ChromiumOS builds running very soon.