The prototypes are said to be based on heavily modified Toyota vehicles, and reports say Tesla has signed a deal to pass them over by the end of July.
Tesla's chief technology officer, JB Straubel, is quated as saying in a recent Automotive News report,
"Since our announcement in May, Toyota and Tesla engineering teams have made a lot of progress in a short amount of time, and it is exciting to start seeing some initial results."
No word has been spread as to what kind of prototypes the two cars are and what specifications they have, as Tesla has been noted as refusing to comment, but Tesla has said the Toyota-based cars are fitted with Tesla batteries and motors. Toyota has also said it is working on an electric two-seater 'urban commuter' though, which Toyota is hoping will achieve a range of 80km per charge.