It's been rumored forever that he survived the sarlacc pit but never confirmed in canon. He hasn't been mentioned with regard to this show at all other than the fact that he isn't the Mandalorian. I doubt that the spoiler in a first episode would reveal tne main character's identify. My guess is the first episode shows us that Fett survived and will be on the show in some capacity, either as a mentor or as a rival for the Mandalorian.

I'm hype about seeing new lore re: the bounty hunter community. Some of my favorite Clone Wars episodes followed bounty hunters.