It looks like AT is revamping the OC9 moving coil cartridge lineup similar to the VM series moving magnet cartridge model range with the stylus being the differentiating feature. Starts in the low end with an elliptical stylus and works up through the different line contact cuts (microline, Shibata, Special Line contact) One important change is that the mounting holes are tapped for easy mounting/adjustment. It's about time!