They haven't started shipping as far as I know, but they seem to be very close to it. Last update on their blog is from Nov 5th, and it sounds like they expect to start shipping by end of this month.
That's all I could tell. The main page doesn't say anything about a pre-order (that I could tell anyway) and I'm not sure if I trust them when they say they are "close to shipping" as they've been close to shipping for a year now. Thanks for the blog link, I didn't even think to check that.