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Yeah, that one (Vecna: Eye of Ruin).

Basically, Vecna decided to go Thanos on the D&D multiverse, and some of the famous NPCs from all realms decide to join and stop it. Obviously it'll group all famous NPCs, so expect to see Drizzt and Mordenkainen but not others. Of course, the players will be key participants.

(Curiously enough, the Wizards Three were changed. Mordenkainen is the only one that remains, but Elminster and Raistlin Majere are gone, replaced by Alustriel and Tasha.)