To me it looks like the SD9 Pro is, or will be Ketron's new "flagship".
I don't think there will be a new Audya, but some sofwareupdates as AJ say will come.
Guess there is a limit in the hardware how much updates it's possible without replace or add something.
By the time Ketron show up a new "top of the line" arranger kb I think it's going to be a SD9 succesor, maybe in both 61 and 76 key version.
Also popularity / quantity of sales will be very importand for the future steps. At the end, it's all about business.