That trailer looks great. I am happy to see there is no delay to its release, and that the author and creator's name, JK Rowling, is included this time. I'm excited to watch this movie.
My guess is that because Lego knew that the outside-Hogwarts sets would require new moulds this time, they decided to focus on sections of Hogwarts that weren't covering new ground/new characters, and so wouldn't require any new moulds in them. I expect to see a new werewolf head, a new Grim dog, the baby Thestral (confirmed), and perhaps a Kreacher head or Mermaid/Krum Shark depending on the still-secret set? Would Yaxley need a new hairpiece, though? Although, many of the sets this year have higher price-to-piece ratios than usual, so maybe we'll see more new moulds than usual? I believe summer 2021 had 4 (Hermione's cat head, Fluffy's head, Basilisk's head and Pixie), summer 2020 had 3 (Otter, Hare and flying Hedwig) and summer 2019 had 3 (Buckbeak, Stag and Beauxbaton's hat/hair). Did I miss any? The past couple of years show they don't mind prioritising new creature elements.