I really hope that BMW make full use of all of their cameras. I want a dash cam, not just for accidents, but to be able to press a button and bookmark/save something that was happening on the road whilst driving.
Also, the sentry mode like Tesla needs to record the outside as well as the inside. When someone breaks in, its quite possible you won't get a good shot of their face, but if they are scoping out the vehicle first, you may well get a good view. I'm talking from experience here. One of our neighbours had a Tesla broken into over Christmas, and wait for it, the police caught the guy after receiving all the footage from the outside cameras that was recorded. It was super clear footage and convinced me of the need to record everything not just inside.