So it seems that the recent Argos leak has been confirmed true:
The release date has been confirmed for October 30th.
If you're wondering why it's only for Switch and Xbox One: the game released on PS4 last year and the PC doesn't need it in the first place.
Warner Bros. Interactive Entertainment, TT Games and The LEGO® Group today announced the LEGO® Harry Potter™: Collection, bringing LEGO® Harry Potter™: Years 1-4 and LEGO® Harry Potter™: Years 5-7 to Nintendo Switch™ and Xbox One for the first time with both top-selling videogames remastered in one package.
The release date has been confirmed for October 30th.
If you're wondering why it's only for Switch and Xbox One: the game released on PS4 last year and the PC doesn't need it in the first place.