Yh, Fin is a Makluan too. iirc in the comics, the rings actually powered their space ship.
I don’t think they’ll do Fin Fang Foom because I’m sure I heard something about the name being racially problematic? I can’t remember if I heard something about The Great Protector Dragon basically being the MCU Fin Fang Foom, I’m not too sure.
Unless the beacon is the set up for the next big bad of the whole Saga which I’m split between, I thought Kang would be the next Thanos-level villain, but the “beacon” end credits scene seems like it’s setting up the next Avengers film. Maybe the rings are linked to Kang, I just didn’t think they were. They could just be the setup for the sequel, but the scene made it feel like the consequences were gonna be bigger than just being a setup for a sequel.