Here's what we know for a fact. Techland is bringing something to the Switch. The company teased news earlier this week. What we don't know is what project they have planned. That's where the rumor side of this story comes into play.
A Polish gaming site is claiming to have inside information on Techland's plans, and they say that a port of Call of Juarez: Gunslinger is in order. Certainly anything in Techland's past is an option, and we know that Dying Light 2 isn't coming to Switch. I guess we'll just have to hang tight and see if Techland confirms Call of Juarez: Gunslinger in the near future.