The only thing they did in the recall was the same floor mat anchor as so many other cases.
"NASA engineers found no electronic flaws in Toyota vehicles capable of producing the large throttle openings required to create dangerous high-speed unintended acceleration incidents. The two mechanical safety defects identified by NHTSA more than a year ago – “sticking” accelerator pedals and a design flaw that enabled accelerator pedals to become trapped by floor mats – remain the only known causes for these kinds of unsafe unintended acceleration incidents. Toyota has recalled nearly 8 million vehicles in the United States for these two defects." -- transportation.gov
Cosmic rays and other wild theories over the simple theory of driver error. Even with a stuck throttle, the brakes will still stop a car (not to mention shifting into neutral still works).