Paul Vigay seems to be suggesting that an Iyonix 2 was close, and it only needed 5K to finish from 20 people. In his slightly ambigious statement (5K each, or 5K total), I have decided to interpret it as 5K each, given 5K total is a piffling amount. 100K is more than enough to /design/ a replacement from scratch, so one assumes that the Iyonix 2 hadn't gone beyond the "would be nice" stage.
This leaves us only with Advantage Six, Virtual Acorn, and RPCemu for the future. I do not see Castle as having a future trying to license RISC OS to others (who would license it?)- I suspect they'll even have to pay their company returns out of their directors' own pockets. They're doomed.