This is my guess from observing the pictures and online videos:
The orange piece on the outside of the mirrors appears to be a reflector and/or night time parking/running lamp. They do not flash when signaling, at least I didn't see them flash in one of the online videos I saw when the turn signal in the headlight was flashing. They do seem to be faintly lit up when the parking lights are on.
On the inside of the mirror, there is the same small flashing indicator like we have now in the bottom black piece of the mirror below the glass.