EDIT: Ignore the first paragraph below; @dyarosia mentioned correctly they're working on their own vision system, so they probably buy generic camera units.
(IGNORE THIS: The surround cameras are likely still in collaboration with Mobileye, since in their case, Mobileye doesn't just give the camera hardware but also has a fair bit of software that makes all the cameras come together. It's not too likely Tesla's duplicated this so quickly.)
Ultrasonic sensors though are dirt cheap (in the few dollars range), and they probably come from one of the many tier 1 suppliers (Bosch, Delphi, etc) that makes them. These are the technology that powered those beeping back distance sensors for 10+ years.
The real news here is that again, LiDAR is absent. It seems like Tesla's pretty confident they can get to full autonomous self driving without the point cloud data that LiDAR provides. Now THAT'D be impressive!
