Square Enix sent out the following
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SQUARE ENIX® announced that DRAGON QUEST MONSTERS: THE DARK PRINCE is launching worldwide on December 1, 2023, on Nintendo Switch™. DRAGON QUEST MONSTERS: THE DARK PRINCE gives players the power to command and recruit various types of monsters to join them on an epic new adventure.

One of the most powerful tools in the player arsenal is the newly evolved synthesis system which allows players to create completely new monsters by combining those already on their roster. Players can experiment and eventually unlock over 500 monsters, including franchise favourites, dark lords, and completely new creatures. Once players have assembled their dream roster, they can take their teams of powerful monsters online, to battle against other Monster Wranglers around the world.
DRAGON QUEST MONSTERS: THE DARK PRINCE will be available for Nintendo Switch™ on December 1, 2023.
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You can see the trailer below