Laughable. To suggest Castle can viably survive in the ARM embedded market isn't just a pipedream, it's the dream of a naive optimist. There are already companies with 10x the staff in each of the possible embedded ARM markets, and there's no way in hell Castle will be able to compete.
Especially if they're trying to do it with RISC OS. See Palm/Netgear/Sigma Designs/HP/Compaq for details.