Quite recently I was shared information regarding Pokemon Legends Z-A's pre order bonuses.
Pre Orders will open immediately after the second trailer at the June 2024 Nintendo Direct. Pokemon Legends Z-A will retail for $69.99 and come with two pre order only clothing sets and the choice of one of two Pokemon games. For a limited time Pokemon X and Pokemon Y will be available on Nintendo Switch this October and only accessible with a pre order for Pokemon Legends Z-A. After Pokemon Legends Z-A releases they'll be available for purchase separately. Price TBA, but under $60.
Pokemon X and Pokemon Y will feature new and improved graphics and online functionality. They're the exact same games from the 3DS with their features reworked to work as intended on the Nintendo Switch. (Pokemon Amie, Super Training, Surprise Trade, etc) Since they're updated ports the games titles won't change. New additions are mostly QoL additions including the ability to get all mega stones in game. Including New Vegas previously exclusive to Pokemon Omega Ruby and Alpha Sapphire.