The Shin Megami Tensei 3: Nocturne HD Remaster was revealed last month to general amazement, bringing an older classic to the Switch and PS4. When the game does launch in the West next year, it'll be introducing Devil May Cry protagonist Dante as a DLC character.
You can check out the introductory trailer for Dante's guest appearance in the Shin Megami Tensei 3 remaster just below. Dante will be releasing as a DLC pack for the remaster when it launches on October 29 in Japan, and we can pretty safely assume that the same DLC pack will be available when the remaster launches next year in Spring 2021 in the West.
This is chiefly because Dante actually featured in a re-release of the original Shin Megami Tensei 3: Nocturne in 2005. The original Nocturne released in 2004, and Nocturne Maniax released a year later in 2005 for Japan, introducing Dante as a guest character (it was this re-release version of the original game which would be used as the base game for its North American release).
Via Gematsu, you'll have to select the 'New Game - Maniax' option from the title screen in order to put Dante in Shin Megami Tensei 3: Nocturne HD Remaster. Doing this will replace all of Raidou Kuzunoha's appearances with that of Dante, the former of which is another guest character from Devil Summoner 2: Raidou Kuzunoha vs. King Abaddon.
Shin Megami Tensei 3: Nocturne HD Remaster will launch for the PS4 and Nintendo Switch in Spring 2021 in the West. Additionally, the long-awaited Shin Megami Tensei 5 is also set for a simultaneous global launch on the Switch next year in 2021, which Sega has hinted might launch before April.