Telltale casts a pretty wide net
Telltale games can be found on toasters and refrigerators these days, so to hear that they're expanding Batman out into the Nintendo Switch isn't surprising at all.
It's not a sure thing, but Russian retailer Game Buy and European retailer Ozgameshop have provided listings for the game, noting a June 30 release date. It's either a placeholder or a possible "post-E3 excitement it's coming soon" type of thing.
What is a sure thing is that you can always bet on Batman, and that the Switch is very hot right now, and could always use more games to fill its library. If Telltale does strike soon, it'll probably sell enough copies to justify its development.