Koei Tecmo has officially announced Warriors Orochi 4 Ultimate, and it's coming West in February 2020. The game was actually leaked earlier this week following a brief teaser trailer. It'll be available as both a standalone title, and as an expansion for those who already own Warriors Orochi 4.
Ultimate will feature new playable characters, expanded storylines, what-if scenarios, new game modes, and an all-new "true" ending. We weren't huge fans of Warriors Orochi 4 when it released last year, so here's hoping that Ultimate addresses our complaints.