NIS America will pick up the sequel next year.
http://www.nintendoworldreport.com/news/53387/trails-of-cold-steel-iv-confirmed-for-localization
NIS America has announced the localization of the fourth Trails of Cold Steel game.
Originally released for PlayStation 4 in 2018 by Nihon Falcom, NIS America is handling localization of the game for the Switch. No date beyond "2021" is given for the game, but a limited edition of the game with a soundtrack, art book, and cloth poster is now available on the NIS America store for US$99.99.
Trails IV is set immediately following the events of the 3rd game, slated for a June 30 launch on Switch.