I don't think this will turn out to be anything more than a USB storage with added wifi/LTE - no more access than Roadie, Jeda or a homebrew raspberrypie. Their own announcement doesn't mention any partnership with Tesla A New Ring of Security: Introducing Ring Security for Cars | The Ring Blog and only mentions being able to view sentrymode etc footage that you'd find on a USB already - no mention of alarms, alerts, locked/unlocked info
At least one of the announcements said it was a partnership and would allow remote access to all 9 cameras in the Model 3/Y. You can't currently get access to 5 of the cameras with those other solutions.