[citation][nom]caedenv[/nom]Bingo. Perhaps MS is giving RT away to device manufacturers free in order to populate the store?[/citation]
Actually, I picture the conversation going more like this, at least in the case of Barnes and Noble: "You can pay us $15 in licensing fees on every device you sell, and get little or no support from Google while you're working with Android, or you could pay us a discounted $40 per device and get plenty of engineering support from us for your extra $25. Oh, and we'll invest in your higher-education subsidiary."
But you could be right; Microsoft might have decided to offer the OS for free. Of course, if it does that, it will probably have to do that for everyone, not just Barnes and Noble, or there could be legal hell to pay.
The more I think about this, the more intrigued I get. I could see this working out really well for everyone, including app developers, if everything comes together. The Nook will totally be worth it to college kids if they can save money by renting e-books rather than buying physical books that they'll never use again after one or two semesters (I would have loved for this to have been an option for me). And you know they'll be poking around the app store.
Then there's the market of people who read for fun, who don't spend that much time in front of a computer...now they can sneak in a round or two of Angry Birds between chapters. And then there's developers, who will know that there's going to be a bunch of 7" (probably), 1366x768 tablets out there, and can use that as a baseline for designing their apps.