There's a long tradition of connections between Dungeons & Dragons and the videogames based on it. Pool of Radiance, the 1998 videogame that kicked off the Gold Box series, was also released as a pen-and-paper adventure called Ruins of Adventure in the same year. More recently, Baldur's Gate 3 incorporated parts of the adventure Baldur's Gate: Descent into Avernus—if you want to know more about why there are so many tiefling refugees fleeing Elturel, that book has your answer. (Wyll's dad shows up in it too.)
The next D&D supplement is Planescape: Adventures in the Multiverse, and it includes at least a few things players of 1999's Planescape: Torment will recognize. For starters, one piece of official artwork shows the Smoldering Corpse Bar, which either still has Ignus the burning wizard on display or has found a replacement for him.
What's more, the supplement's adventure book, Turn of Fortune's Wheel, opens with a familiar scene. "You wake up in the mortuary," senior game designer F. Wesley Schneider said in a first look video. "I'm sorry to say that you've died. Morte, the snarky floating skull, greets you and you realize that there's a mystery. Your memories are fractured and every time that you come back from the dead, you come back a little different."