HI all,
What I can tell you is that there is specific content that will be made available for regional Korg distributors.
In Romania for example, there is a work-in-progress for creating a .set with many sounds and styles specific for the romanian traditional music.
I do not know many details, but the use of the SD card (there is one) is not what we know, but rather for these encoded extensions that will be available. If you wanted, you could buy the extensions and they will be loaded from this SD card, but you will not be able to save (or change) the content of it.
For that you will have some other internal memory available and of course, the USB.
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.