Edmunds has published the official rules for the promised $1,000,000 contest to see if anyone can create a plausible failure mode that results in unintended acceleration in a factory stock mass produced vehicle. Rules here.
My prediction: some college engineering students will come up with something similar to Prof Gilbert, where they will induce a specific multi-point failure. Edmunds will deem it not "plausible", and will keep their money.
Me, I'm going to submit a photo of a guy stepping on the brake and gas pedals at the same time. It is not following the rules, but, it probably explains a large part of the cases.