I've not seen an MMO yet that actually gives me any reason to believe they're worth playing if I'm not interested in a grind-obsessed-time-sink. Which I'm not. The only ones I gave serious thought to playing were Guild Wars (never got around to it)
Guild Wars was the MMO I bought to try the genre out since it was subscription-free. It has henchmen and you can thus play the game completely solo, but the story and quests are still very lacking compared to a singleplayer RPG, so what is the point? Well, multiplayer for those folks, but nothing for me (and lots of games with better storylines and quests have multiplayer).
While I wouldn't mind a KotOR3... (provided it wasn't as buggy as 2) the draw of a Star Wars MMO is minimal... Star Wars needs story, and MMOs just don't do that beyond the most basic outlines.
We really need more info... they show a lot of dialog and cutscenes in the trailers, and the game has story-heavy supporting characters so you can completely ignore other people, but whether it actually has the story and quest quality of a singleplayer game remains to be seen. Also, even if it does, I will still wonder why I am paying $15 a month when I don't use the "massive" part of the MMO equation.