In an interview with Comicbook, Techland talked about their work on Dying Light 2. Unfortunately, the game will not be coming to Switch, as the engine the game uses is not supported on Switch. That said, Techland seems to have something in the works for the platform.
"We are focusing on AAA content, but I can tell you that we might have a surprise for the Nintendo Switch later this year. I can’t tell you more."
Sounds like something we'll find out about come E3 2019. We'll keep our fingers crossed for more info then.