Dengeki PlayStation has revealed within its release schedule a title called Samurai Warriors: Sanada Maru as a title due to release in Japan for PS4, PS3 and PS Vita this year.
Sanada Maru is a live action TV drama from NHK that started airing in January this year in Japan. While there are no other details known about this game currently, it could potentially be another Koei Tecmo crossover following on from the likes of Dragon Quest Heroes II, Hyrule Warriors and the upcoming Berserk Musou. For those curious, the Japanese website for the TV drama of Sanada Maru is here.
