It just dawned on me that there seems to be a shift away from the earlier or more traditional front mounting of the microdriver. Designs like the fxt90, and fxz200 series come to mind as well as the famed sennheiser ie800. They all have the microdrivers inside of a housing, out of the ear canal.
You can also see this in the new ATH im50 & im70. Dual microdrivers inside of a housing, away from the ear canal. I wonder if there are benefits to that style. I would think that is kind of a step backwards but I'm not sure.
You can see a shift from the likes of the JVC fxc51/71 and fxd80/70/60 as well as the miles Davis trumpet and Yamaha eph100, to the newer fxt90 and fxz100/200 and the ATH im50/70 as well as the havi b3.
It will be interesting to see where they end up.