I wouldn't really say that confirms anything. Samurai within the FF universe is not only a job class, it's also the name of an enemy. The files observed in Sokan's showing may simply be some form of encounter music as well.
Does Soken only work on XIV?
2 announced in London. The rest announced at the Tokyo fan fest. That will be another $20 for the stream. Please look forward to it.
Or it may, simply be Samurai sfx sounds, Job quest music file/folder. (If you notice the Ninja quest, in the trailer. Ninja's seem to have their own music theme as well). Either way Ill take it. And its obvious he was trying to make people catch it, as its the only folder in English, at a NA convention.
This expansion seems to be dwelling on the Northern, west and eastern sides of Eorzea, plus the continent that's hovering above. Ill anticipate my wondering Samurai npc who will flag my class.
It's fine that they haven't and there's still a lot of time for them to tease pieces as we get closer to Spring 2015. We already know we're getting a little bit of job stuff teased on the 25th at the London FanFest. Either way I'm really excited to see what's coming.