Yes, but even drivers like 2000/CI are redesigned inside with improved shock-proofing over the old design.
I would also say the newer designs are better for specific frequency application - like SWFK (ultra tweeter) or 3800 (the most badass woofer) - there's a lot of modifications with newer designs possible like highly inductive coils or Type III damping, but in most cases it's still working on existing drivers families. In most cases as well developing completely new drivers is not necessary.
Was the SWFK out just recently? The best tweeter I heard from Knowles was the WBFK but that was a few years back.
Anyway I also think there're already tons of things the companies could do with available transducers. Call me a fanboy but FitEar has been sticking with only 3 models ever since they started out 7 years ago, and 2 out of 3 were designed in the 80s. Yet they are probably one of those that lead the market atm in terms of sound tuning. The next models that're rumored to be coming out next month are drawing attention already.