From FFP in the comments section today.
“What about the Wandering Samurai ? What are the difference with this new Samurai ?” – They are similar, but different. Both build up Fury as they battle Enemies and unleash Battle Tactics as power attacks. But they each have their own unique set of Battle Tactics. The Wandering Samurai from the Original SOBS KS is more of the lone wanderer and sword master type, while the Samurai Warrior is more of a tactical fighter and is used to fighting as a team. Also, the Samurai Warrior is more armored, but a bit slower. They each have pretty different skill trees too.