Now there's an update as FUD Zilla picked up word that Keller's responsibility as lead of hardware engineering is to create a self-driving car platform from scratch.
Tesla first used Mobileye technology and is currently equipping its cards with the NVIDIA Drive PX 2, but it seems the company wants to go the Apple route by making its own, custom chips:
Tesla wont be driving Keller's self driving platform anytime soon. Don’t be naïve, these things don’t happen overnight, and it will be years until it's ready, and until then Elon has Mobile Eye for legacy cars and Nvidia Tegra PX2 for current Tesla S, X and III cards, Nvidia will get into the future cars too, as long as Elon is not finished with its own self-driving platform.