Not sure if DNC voices can be used by the styles (I know Yamaha's SA2 ones can't), but they sure could be used by the RH solo section...
It just seems utterly pointless to bring DNC out for a PA2X update, and then not release any content until a PA3X. They'd have got a better bang for their buck doing BOTH at the same time...
Even if it is just a few sounds to load up in the sampler, a great sax, a clarinet, some of the most popular SA2 type lead sounds... A) plenty of PA2X users actually WOULD pay for that, rather than just pirate it (Yamaha users pay for extra sounds happily enough), and B) Korg would have something out there to directly challenge SA2 rather than let it have the field to itself until the mythic PA3X arrives (which may still be a good couple of YEARS away).
It's baffling...
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An arranger is just a tool. What matters is what you build with it..!