It's interesting to see how the corporate alliances are shaking out. Bosch is supplying hardware for BMW and Daimler-Mercedes self driving efforts... not sure who is behind Volkswagen Audi Group's efforts, as Stanford's efforts seem to be off the shelf components (LiDAR and such).
Watson is natural language processing. Models of language, search, some amount of logical inference I presume. Not very similar to self-driving cars.