I think we all can agree to the hope of an update in all sorts, and especially of the organ section due to the new Nord organ.
But the Nord Stage has always been about compromises. The keys are i bit on the light end (from a pianist view), the synth-section are based on the NW2, but not quite as powerful as the synth. The same with the organ section.
Based on this i don't agree with the narrative that the NS4 is no longer a flagship if the organ-section isn't severely updated.
The NS4 is two years now. If the development of the new Nord organ 3 was to be based on the compatibility with NS4 I think this would have been a huge drawback and obstacle for the developers.
So hurra for the new Nord organ 3, and lets see (and hope) if it brings any improvements for the NS4.