There's been a rumor floating around since last week that Din is going to die in the finale. As best I can tell, this rumor originated independently from two sources: YouTuber Star Wars Theory (who is a weird drama queen with a public and contentious relationship with Lucasfilm) and another channel called Den of Nerds, which trades in a lot of "Fandom Menace," "M-SHE-U" nonsense. Neither of these guys is well known for breaking major information, although DoN has gotten some things right here and there.
So on the surface, this would be pretty easy to dismiss. Except for last week, Jeff Sneider said he had a source tell him that Pedro Pascal was unhappy with the show and there was behind the scenes discord between him and production. Sneider doesn't bat 1000, but he's not a bullshirt artist either. He used to work for Variety and is very keyed into productions. He broke that there would be three movies, one directed by Dave Filoni, announced at Celebration before anyone else and he was correct.
People who are choosing to believe all of this are pointing to things like the general sidelining of Din in favor of Bo-Katan this season. Also the fact that Pedro Pascal wasn't as Star Wars Celebration last weekend, but pretty much everyone else was. This also isn't the first report of discord between Pascal and Lucasfilm. Grace Randolph, who is legitimately crazy and only right about 30% of the time, reported he stormed off set during season 2. Nobody else ever confirmed or denied that.
This is making the rounds big time and I've seen people talking about it all over the place, but for me personally I think the evidence is weak. No established leakers have said anything about it. Although they didn't say anything about Jack Black and Lizzo, either. We shall see. Just broaching the subject since this rumor has blown up over the past few days.