Jane Anson has a short piece in Decanter about the use of lasers in the sorting process during the most recent Bordeaux harvest. From the article:
New sorting machines, using laser optics, have been introduced at Chateau Pavie and Chateau Grand Corbin Despagne, and Chateau Margaux has an entirely new gravity-led reception system for the grapes, taking them first in small trays and then by a pulley system into the vats.
Bucher Vaslin makes one such machine. They have a pretty cool video demonstrating how the process works. Hopefully, I'll have more on this soon.