This will finally be announced at PSX. Dante, Vergil, and Nero will all be playable on the game. I don't know if that will be confirmed at PSX in particular alongside the reveal, but multiple sources have informed me that all three characters are on it and you can play as them.
I was told it'll be for PS4, PC, and Nintendo Switch. There was no Xbox One version mentioned to me. The game should be revealed by the end of the year and make its 21st anniversary at least. One trustworthy source told me it would be revealed at PSX.
The PS5 Exists.