Koei Tecmo have filed a trademark for “Seiken Musou” in Japan.
While no details have emerged. Some believe that it could a new game in the “Warriors” series as in Japan it is known as the “Musou” series. Another guess is a game based on the upcoming Japanese movie King Arthur: Legend of the Sword.
It’s also worth noting that “Seiken” in Japanese means “Holy Sword”, so it’s possible that it could something completely different.