Pretty freakin' cool.. The idea of watching ANY content this way would be really interesting. I know they premiered the trailer for 'Star Wars Episode IX The Rise of Skywalker' (2019) that way (literally in 'Fortnite') I just wasn't playing the game at that time.
I'm sure I've missed a few others, but either way; what a fun way to watch something with people as your avatars / favorite characters.