Castle have said they are always interested IIRC but Druck reckons they need a processor 3x as fast to justify it. I'm not sure why he says one doesn't exist.
In any case, from what can be gathered it seems the Iyonix has significant potential in itself given there are hardware video format decoders and the possibility of 2nd processors. Besides which, has the graphics acceleration really been stretched yet? Only Quake 2 AFAIK has been said to require it.