At a guess I would say Ketron don't have an unlimited R+D budget, so unless there are some serious issues with the finished product, or possibly even the fact they cannot GET a finished product with reliable operation to owners, then this model (based on average financial considerations) should have hit the shelves already.
After all it didn't bother them too much to release the SD1 with all its bugs and then fix them in due course with OS updates (this is from some Ketron people I have spoken to).
So this leads me to think they cannot get a reliable product to market, either because of technology or because they went in with the wrong amount of processing power and technology in the first place.