All of these things that are supposedly lacking in the 120 II, like the enclosure material or lack of a new driver, cost money. For Neumann to want to invest the money into this development, it would need to have a purpose. The current tweeter design, as seen from their other speakers, is incredibly linear when paired with DSP and has no issues with output. What issue are they trying to solve for, aside from marketing it as new, by investing money into developing a new one? Having a more expensive enclosure might looks nice on paper or in photos, but in most cases having it be able to better survive falls and constant travel isn't a necessity.
All of this engineering work would cost them money, cost time, and make the resulting speakers cost more which would then make comparisons to other models worse for them. If doing so would vastly improve performance or fix an existing problem, then they would do that. But I've not seen a problem identified that would be solved for most users of these speakers, aside from aesthetics or not being new. Is there something they need to fix with these that we aren't aware of that you can point out?