Square Enix is preparing a demo for Trials of Mana. Gamstat, which tracks upcoming PlayStation Network releases, has a specific listing for the trial version.
Assuming that the listing is accurate, Switch should be getting it as well. One previous example of a Square Enix demo is Dragon Quest Builders 2, which was offered on both Switch and PS4.
Trials of Mana won’t be out until April 24, so there’s a chance that we won’t be seeing the demo anytime soon. Still, if we hear anything official, we’ll let you know.