Read some more on Cold Steel IV from ACGHK 2018 event:
Rean’s voice actor, Kouki Uchiyama, was also present at the event, and he confirmed that the voice acting for Trails of Cold Steel IV is complete. As he thanked the staff for their hard work, he realized how quickly five years had passed since he first voiced the character. In the beginning, he felt a lot of pressure on voice acting an important main character in a series as well-known as the Trails series.
While Estelle, Joshua, and Renne have been confirmed to appear in Trails of Cold Steel IV, Kondo teased that even more nostalgic characters from the Trails in the Sky trilogy will return, which hasn’t been revealed even in Japan. This is also true for the Zero/Ao no Kiseki duology.
Trails of Cold Steel IV is set to come out this year in Japan, and is being released in Chinese in Early 2019, with localization work being handled by Sony Interactive Entertainment.