It’s been a long time coming, but Elphelt Valentine has been revealed to finally be coming as DLC for Guilty Gear: Strive TOMORROW! A 3-on-3 mode has also been confirmed to be coming next year!
Announcement article: https://www.bandainamcoent.asia/sea/news/guilty-gear-strive-DLC11-announcement
Trailer: https://www.youtube.com/watch?v=vxMKubqMIVY
Guilty Gear: Strive on FAB: http://www.fightabase.com/gamesMain.aspx?id=1194