Let me add a small amount of data to the mix.
I am scheduled for the upgrade and I am also going to upgrade the computer. Note: this has NOT been done yet.
However, on 2 separate occasions, my Instrument Cluster screen (smaller screen) has shown a red traffic light indicator when I have gone through a yellow/red light. On one occasion the car warned me and on the other the red dot (only a red dot, not the entire traffic signal icon) remained on the dash until I turned off the car (this may be evidence that MCU1 can't handle all the data, I'm not sure).
Anyway, I thought it was interesting that my car is not only seeing, but also occasionally showing traffic light visulation without HW 3.0 nor MCU2.
Mine is a 12/2016 Order - 2/2017 Delivery.