They are considering open sourcing "elements" of RISC OS. I would very much like to have a go at two of these elements: the CDFS driver, and the USB podule stack. I'm sure some of you can come up with more such elements to add to the list. I have suggested to John Ballance the idea of open sourcing those two.
With a suitable license, it is possible to open source appropriate parts without giving away the whole lot.