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He-Man and the Masters of the Universe: Legends From Castle Grayskull (Scholastic graphic novel) has been scrubbed of plot information, but it's supposed to ship February 1, 2022 while the series itself premieres October 2021.
The scrubbed synopsis:
>Fresh off of gaining their newfound Powers of Grayskull, and fighting off a whole host of villains, our heroes -- Adam, Teela, Krass, Duncan, and Cringer -- face their most daunting challenge yet: spending their first night in their new home, Castle Grayskull! The teens do their best to settle in, but it's not so easy. The castle is definitely not what it seems: A labyrinth. A spooky puzzle-box of magic and mystery. Even its rooms have rooms! Follow along in this original graphic novel as our heroes battle monsters, flesh-eating snacks, and their own memories. The graphic novel will feature exclusive lore straight from the creators of the Netflix animated series, He-Man and the Masters of the Universe. Get ready for an action-packed adventure!
What this says to me is that Skeletor is going to get the Power of Grayskull first and our heroes are going to kick him out, harkening back to the first two mini-comics. Castle Grayskull won't be a safe, inviting place for heroes like in Filmation and 200X, because there's no experienced Sorceress to make it so. Teela will take Teela-Na's place in this continuity, and be 15-16.