We’re also told that a new USM motor will also be introduced some time this year, and it will be called “C-USM”, which stands for Compact Ultrasonic Motor. This technology is likely to first appear in a new 50mm lens.
No no no no no!!! It is a compact USM motor that made the last 50mm f1.4 a piece of unreliable garbage. Why would you do this again when you already have a reliable usm motor that is small enough to fit in the new 24, 28, 35 mm IS lenses?