This question contains spoilers…
(view spoiler)[In Magnus Chase, we already know we are going to be seeing Annabeth, but will we be seeing any other members of the 7? I'd love to see more of Leo :) (hide spoiler)]
Don't expect Magnus Chase to be all about Heroes of Olympus. It's not. Totally separate series. We've got to let Magnus be Magnus, not get party-crashed by a mob of other characters from previous books.