According to a report by Bloomberg, citing an internal source, the two models chosen for the task are the Toyota RAV4 and Lexus RX. The source says that, despite the fact Toyota wanted to test Tesla's technology on the Corolla, the two models mentioned above better suited the weight of Tesla’s battery pack.
As for the technical details behind the prototypes, details are nearly absent. Bloomberg however cites an email sent by Tesla's CEO, Elon Musk, saying “we anticipate range and acceleration exceeding that of other announced electric vehicles of this class."
As hinted over the weekend, Tesla and Toyota signed a deal which requires the former to deliver two rechargeable prototype electric cars to Toyota as early as this month. The news was confirmed by JB Straubel, Tesla's chief technology officer.
“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,” Straubel said.
Toyota and Tesla began working together in May, after the two announced they will try to revive the former New United Motor Manufacturing (NUMMI) as an electric vehicle production hub. Toyota announced then it would invest $50 million in the joint venture, which will also include the development of an electric vehicle together with Tesla.