While I'm not sure when the OEMs will be required to comply, I noticed that the 2013 Monroney Labels for the 2013 Toyota and Ford vehicles on display at the Barrett-Jackson auction in Orange County had QR codes from the U.S. EPA.
Here's a picture of a portion of a Monroney Label from a 2013 Toyota Prius:
If you scan the QR code with your smartphone you'll be taken to an EPA website that provides additional information about the vehicle's fuel mileage, emissions, cost of operation, etc.
One section I noticed was titled
"Reported by Drivers Like You" that lists the range and average fuel economy which apparently were reported by people who already owned the vehicle. While I'm all for the dissention of information, I'm not certain how the EPA gathers this information or what safeguards are in place to ensure that a vehicle isn't "spammed" with incorrect information that either improves or worsens the vehicle's reported performance.
Overall, I love new technology and I think this is a good use of a QR code.