The sound was just shown by Burger King in a tweet, who are promoting a Burger King-Playstation partnership which will be unveiled on the 15th (presumably a promotion to win a free PS5, much like the Xbox-Taco Bell promotion that is currently ongoing):
— PlayStation (@Playstation) October 12, 2020
The PS5 start-up screen was previously leaked back in June, and has now been confirmed to be real by the the Burger-King ad having the same sound. Here you can see the Xbox Series and PS5 start-up screens for comparison, as well as a start-up speed test:
Last edited by shikamaru317 - on 13 October 2020