Falcom announced at TGS 2018 that Trails of Cold Steel IV will be released in Asia with Traditional Chinese text on March 7, 2019. [Thanks, Bahamut!]
Apart from the regular physical version, the Chinese release is also getting an Asia Original Limited Box that includes a poster, DLC, and a mini OST. There will also be a Digital Premium Edition that comes with a full set of DLC outfits, as well as a DLC item set.
The Legend of Heroes: Trails of Cold Steel IV launches on September 27, 2018, on PlayStation 4 as well.