iceryan, thank you for your post.
Yes, it's true that Kawai Japan recently issued a software update for the CS11/CS8 and CA97/CA67. However, as noted at the page above, the improvements to the speaker EQ and volume are only applicable to the CS8 model, not the CS11. The update also resolves a UI issue regarding the User EQ function, whereby the Mid-Low and Mid-High frequency ranges could be set to a broader range than was actually controllable. But again, this only relates to the display - the sound produced by the instrument itself is not affected.
I actually asked PJCa to check the software version of his CS11 via PM, but this was before I learned that the forthcoming update (which at that time had yet to be officially issued by R&D) did not affect the sound of the CS11 - only the CS8.
If I may quickly ask a question regarding software updates it states on the link posted above that "Note that Kawai software updates are cumulative, i.e. the v1.09 update includes any fixes and improvements provided with all previous versions."
I never noticed this before, when I got my Kawai I think I just put the latest update on it which I believe was v1.08 at the time. I can't remember what version it was on out of the box, but if it were on v1.00 would that mean I haven't got any of the fixes made from 1.01-1.07? If that's the case should I go back and apply all the updates in order from v1.01 to v1.09?