https://www.cnet.com/news/game-of-thrones-season-8-opening-credits-hint-at-events-to-come/

Astrolabe newnessThe credits begin inside of an elaborate astronomical instrument called an astrolabe. If you're quick on the pause button, you can see it's covered with murals depicting past plotlines that shaped the story, from the Red Wedding to the birth of Daenerys' dragons to the fall of the Wall. Look for the Red Comet, an omen of major events, such as the dragons' return.

Speaking of the Wall...Once the credits move to the gigantic map, they begin at the Wall, which now has a huge chunk missing, thanks to you-know-who.