According to an update by Brook Drumm to the Printrbot Kickstarter today:

FILES TO BE RELEASED FRIDAY

A vocal minority will be pleased hear that the files will be released this Friday. It should be really interesting to watch what follows the release. Some will jump in and help expand and refine the design. Others will try to sell the parts on ebay. Whatever happens, I am excited to see my design out there in the wild. We have built and rebuilt dozens of Printrbots, printed thousands of parts, and logged hundreds of hours of printing. These things work. They work well. Revisions on the part files have slowed and I feel good about releasing the files this week. Enjoy.