\ As Postywillow said, this has long been rumored. I wonder what this will do for parts supplies. I'm guessing more than half of the 3.5M 1200s made are still in use, and they will all need new pitch sliders, PCBs etc over the years. I'm glad I had my 3 serviced a couple years ago.
As illustrated in the post I made above, the original 5D has a better T-stop loss than the 5Deuce.
F/1.4: 5D -0.25EV; 5D II -0.45EV
F/1.2: 5D -0.4EV; 5D II -0.6EV