The LEGO Harry Potter Hogwarts 2021 sets won't be compatible with previous castle sections
Amazon.com: LEGO Harry Potter Advent Calendar 76390 Christmas Gift for Kids; 24 Cool Harry Potter Toys Including 6 Minifigures; New 2021 (274 Pieces) : Toys & Games
2021 LEGO Harry Potter sets officially revealed – Blockwarts – A LEGO Harry Potter fan site
Amazon.com: LEGO Harry Potter Hogwarts Moment: Herbology Class 76384 Professor Sprout's Classroom in a Brick Book Playset, New 2021 (233 Pieces) : Toys & Games