The Seattle Times posted an editorial article about Valve and it was accompanied by photos of Valve employees posing with the Steam Machine and controller.
It's worth noting that there will be a variety of Steam Machines available. According to the article, the different models will be announced in CES this coming January and it will be sold in mid 2014.
Earlier this month, Valve detailed the prototype machine's specs and announced that people could sign-up for the beta on September. The photo posted above is the machine that beta testers will be able to get their hands on.