They are owned by DCE.
DCE has no interest in making them anymore, but I bet they'd still charge a lot to buy the rights.
The problem is that the PowerPC accelerator boards would cost too much, no reason not to get a full-on AmigaOne for that kinda price. (or Pegasos if you can find it, amigaones are still in stock in the US atleast it seems) Something like a real AmiJoe would be much more cost effective, or something using atleast a 600MHZ G3. Haage + Partner's PPC software (came with OS3.5 and above) is technically retargetable, just never had any other boards to port it to.
PS: Creepy thought, wouldn't it be possible for H+P to write new drivers and relase WarpOS or whatever for AmigaOne/Os4 machines? Technically possible I imagine, wow.