Gal*Gun 2 is coming out this Spring in North America and Europe, but our friends in Japan are getting the title next week on March 15th, 2018. The game is available to preload right now in Japan, and we have some good news for those who don't feel like waiting longer to play. The Japanese version does indeed support English!
Furthermore, if you preload the Japanese version, the Switch icon will get swapped over to one with the English logo depending on your region. Looks like there may be one universal version of Gun*Gal 2 released worldwide.