Brake Override System

According to the below link the Prius already has a brake override to prevent uncontrolled acceleration if the brake is pressed. Does anyone know if this is correct or any details on how it works?

Toyota Vehicles : Frequently Asked Questions For Sticking Accelerator Pedal Recall and Suspension of Sales / Toyota

In addition, as a separate measure independent of the vehicle-based remedy, Toyota will install a brake override system onto the involved Camry, Avalon, and Lexus ES 350, IS 350 and IS 250 models as an extra measure of confidence. This system cuts engine power in case of simultaneous application of both the accelerator and brake pedals.

The recall remedies for accelerator pedal entrapment for the Corolla, Matrix, Venza, Highlander, Tacoma, Tundra, and Prius will occur on a rolling schedule during 2010. No details have been provided to this point. Please note that the Prius, and all hybrids for that matter, already have a version of the override system. The override system will be standard by the end of 2010.