I have always said you need to look to the past to get an idea of where the future is going. Numerically, Ketron haven't exactly been overflowing with new audio based styles on the SD1+, SD5, etc..

And the cost and time to produce new audio based styles must be an order or two of magnitude greater than doing it with MIDI...

I'm afraid it just doesn't bode that well, IMO.
_________________________
An arranger is just a tool. What matters is what you build with it..!