With so many good arranger choices out there now: Korg, Ketron, Yamaha..even Casio and others, .why speculate? For example, the Ketron SD9 is a real keyboard...videos exist

Even though the SD 9 apparently isn't ready for prime time, at least we have an idea of what it is. After 4 years, all that exists for a TOTL arranger for Yamaha are rumors and possibly fake videos.

If Yamaha does come out with something new arranger wise, great but there's so much good stuff out there right now...if you want a new arranger, why wait?