Today during Nintendo's surprise Nintendo Direct Mini, the platform holder revealed one of the titles that was previously rumored. Dark Souls is heading to Nintendo Switch and it already has a firm release date: May 25, 2018.
Dark Souls: Remastered will include the base game and the downloadable content, Artorias of the Abyss.
Kotaku UK is also reporting that Dark Souls: Remastered will be heading to PlayStation 4, Xbox One, and PC during the same time frame. The outlets says the Switch port will be handled by a seperate company from the other releases, with the overall remaster being based on the Dark Souls 3 engine. Further, Bandai Namco is planning to remaster all three games, but is doing them one at a time.
EDIT: And in short order, Bandai Namco has confirmed Dark Souls: Remastered for all four platforms.