In a recent interview , Suda51 was asked about Killer7, and whether or not there’s a chance for a Switch version of it.
His response was rather telling
“I’d love to bring Killer7 to Switch. However, Capcom owns 100% of the rights to that game, it’s really thanks to them that the PC version came out at all just because they OK’d it and a publisher came along to help distribute it, which is really great. But I’d have to talk to them again to see if it’s possible to get the ball rolling on Switch. The thing about Killer 7 is that it really was a sudden release, we weren’t able to do much promotion for it before it came out, so I really feel like I have a duty to make sure that people are even aware that it exists.”
Suda51 has actually talked about a possible Killer7 release on Nintendo Switch before. He previously said that strong sales of the recent Steam release of the game could lead to a Switch version.