As someone who was pulling for basically this exact idea, I'm a little disappointed that it seems like it'll be coming into the game as DPS. Not that it was bad as DPS in FFXI.

My favorite thing you got on SAM in FFXI was Overwhelm- just because it was so cool conceptually, doing more damage to enemies from the front. It really drove home the whole "Stand and Fight" feel the class had. That said, I think there's potential here for Samurai as DPS- maybe give them something like what they had in FF Tactics, drawing spirits out of their blades for various effects with sort of an exorcist angle to the class since Samurai vs Demons seems to be a thing.