Batman: Arkham Trilogy includes Batman: Arkham Asylum, Batman: Arkham City, and Batman: Arkham Knight with all previously released downloadable content from all three titles. Each title was ported by Turn Me Up Games.
Here is the full message from Warner Bros. Games on the delay:
Batman: Arkham Trilogy for Nintendo Switch will now launch on December 1, 2023.
More time is needed to bring players the best possible experience on Nintendo Switch. We apologize to fans who are excited to play this version of the trilogy. Thank you for your patience.