For Enhanced Autopilot to work, it needs the new Tesla vision "neural net," which uses eight surround cameras, 12 updated ultrasonic sensors, and forward-facing radar to see and understand the world around it. Meshing all of these inputs is the challenge for the updated Autopilot system. Musk Tweeted that things are working, but need more real-world testing:
Tesla Autopilot vision neural net now working well. Just need to get a lot of road time to validate in a wide range of environments.— Elon Musk (@elonmusk) December 22, 2016
You can see a version of what a new Tesla, one equipped with all this new tech, sees in this video. Musk had promised that Autopilot 8.1 would arrive in the middle of December, but that deadline has passed and Musk apparently wants to get it all right before sending it out to the masses.