As for the future direction of NetBSD/ofppc, the goal is for this port to run on as many OpenFirmware and CHRP based PowerPC machines as possible. Currently the port is working on the Pegasos II. Work is in-progress to port it to other machines, such as CHRP-based IBM RS/6000's and the EFIKA.
I'm a little bit confused, isn't he NetBSD/prep responsible for RS6000? Best Regards Stephan