From Gematsu: “Takakage Kobayakawa, Hisahide Matsunaga, Kagetora Nagao, Shingen Takeda, and Motonari Mori will be playable characters in Samurai Warriors 5, publisher Koei Tecmo and developer Omega Force announced.”
Source: N4G PC Samurai Warriors 5 adds Kobayakawa, Matsunaga, Nagao, Takeda, and Mori