doesnt look like its any soon, but then there is mist and fpga-arcade should be available some day for wider audience, i think performance wise this all remains on similar level, so no need to hold your breath.
I'm interested in the role of the Dragonball - i was under the impression that it couldn't be used as a drop-in replacement for a normal 68k chip due to differences in the instruction set. If this is the case - how have they circumvented that ? If not - then how come no-one has designed an accelerator around one yet? Its an interesting design and although it might not be that nippy its definitely a step forward and the addition of the AGA core makes it a very interesting proposition indeed. (Partly the reason I didnt get an original Minimig was that this was missing).