Story and Lore Information

Is it the sequel of Baldur's Gate 1 and 2?
Yes. The story takes place 100 years after the events in Baldur’s Gate 2 and shortly after the events of Descent into Avernus. We don’t want to spoil anything about the story but it will be connected to the previous games in meaningful ways. 

How is the storyline linked to D&D?
Baldur’s Gate 3 takes place right after the events of Descent into Avernus. The holy city of Elturel disappeared from the Forgotten Realms and descended into Avernus, the first layer of the Nine Hells. In our canon, it was saved by a party of heroes. The game is based on the 5th edition ruleset of D&D and was created closely together with Wizards of the Coast. 

How do camps work in the game, and how big of a role do they play?
Camping plays an important role. Camp is where your party rests and recovers (HP and spells). You can also engage in dialogues with companions, including romance. You'll also find NPCs on your adventure who join the camp temporarily or on a more permanent basis, becoming camp followers. Some will offer services, others have a narrative function.

Is your party permanent or can you change members out throughout the adventure?
Recruited companions will be at camp when not in the adventuring party, and can be swapped in and out at camp. After the first act however you are going to have to commit, also just like in real life.