Earlier this week, Bandai Namco has announced that Dark Souls: Remastered will be delayed to Summer 2018. The PS4, Xbox One, and PC versions are still scheduled to release on May 25th of this year. The tweet of this update can be seen below:
Due to various reasons, the release for the Nintendo Switch version of "Dark Souls Remastered" has been moved to Summer, 2018. We offer our sincerest apologies to everyone anticipating its release, and hope you will enjoy being able to play Dark Souls anywhere at any time.
— FROMSOFTWARE (@fromsoftware_pr) April 17, 2018