The delays to Elden Ring and Dark Souls: Nightfall are disappointing but will hopefully be worth the wait.
The Prepare to Die edition was released in 2012 and contained extra PvP and PvE content, while the Dark Souls Remastered game was released in 2018 with improved graphics and performance as well as the content in the Prepare to Die Edition and the Artorias of the Abyss DLC. Dark Souls: Nightfall released a new mod release date update trailer on its YouTube channel, and also confirmed in a comment that Nightfall will only work on the Dark Souls Remastered version and not the Prepare to Die Edition of the game.