I'm surprised that noone has mentioned this yet, but this is the first year that the event will have one of it's "Expo" locations within a Soundstage near the Bowl.
The new hall is located at Soundstage 21, which has been used for Halloween Horror Nights for multiple years; as both the Soundstage 33 expo hall and Soundstage 21 expo hall have different lines to enter.
The SS21 expo hall contains Warner Bros. Games, Warner Bros. Studio Tour London – The Making of Harry Potter, Pottermore/Audible, & Harry Potter and the Cursed Child while SS23's expo hall contains Scholastic, Minalima, Harry Potter: The Exhibition and Warner Bros. Studio Tour London – The Making of Harry Potter.