I don't think MS would be thrilled about that. I think they are making it free as an incentive to get OEMs to promote their platform. The OEMs aren't going to do that if they can't make money in the process, and OEMs don't make money unless they actually sell something. That said I don't think MS will allow you to do that, thus I'd wager that the price of free only applies to licensed partners.
As it is right now, you can't even buy RT as a standalone license like you can regular Windows, and I haven't seen them giving it away either (except as a repair tool for Surface RT owners.)