While I think a robotic guide dog makes some sense, if they can develop the range and the right software, I am not too sure that Hyundai and the ad guys who made the video, really get how a guide dog works.
The blind guy stands up and the 'dog' jumps up and trots off in front of him, leaving the guy to continue with his stick.
In spite of that Boston are likely to do a lot better with Hyundai's direction than being just another one on the list of Softbank tech acquisitions. I know nothing about their cars but their industrial kit is not bad.