Sega Fes 2018 is set to take place from April 14-15, 2018 in Japan, and the Valkyria Chronicles 4 Twitter announced that more information about the Nintendo Switch version of the game will be announced there, alongside gameplay of the ‘The Two Valkyria’ DLC scenario.
The entire schedule for Sega Fes 2018 is available here, and clicking on the YouTube Live timeslots will bring you to the correct livestream video. The Valkyria Chronicles 4 segment will occur from around 4:50pm to 5:30pm JST on April 15, 2018.
Apart from Valkyria Chronicles 4, there is also a stage event for the PS4 version of Border Break on April 14, 2018, from 11:30am to 12:30am JST, where more information revealed.
Valkyria Chronicles 4 is available for PlayStation 4 in Japan. The Nintendo Switch version launches in Summer 2018. It will also release for Xbox One in the West.