Isn't the XMOS chip this one:
http://en.wikipedia.org/wiki/XCoreaccording to wikipedia?
It seems pretty powerfull, at least on paper.
I, for one, would be happy if it could emulate classic miggy and keep this load (or a big part of it anyway) away from the CPU. I've no idea if it'd be possible, but that would be a useful utilization.
Also, afaik, PPC chips are still developed and manufactured under the PowerISA specs which is updated fairly regulary. Price-wise, well, I don't expect it to be cheap, but the 2000$ mark seems too high. Of course I can see the train of logic leading to that figure, but I think it's gonna be much cheaper than that. We'll see....