I'm liking the imperial agent stuff. The description sounded particularly fun.
It's gonna be interesting. There are gonna be soldiers and Jedi who are all patriotic or whatever and then there are those who are intelligence agents seeing the true inner workings of the sith empire. Forever jaded with the knowledge of backroom jockeying. That kind of variety is joyful.
As for next class...well the D&D system would say that the medic is gonna be our next class. For me though I'm kinda hoping that it'll be a droid class. I have no idea how they'd handle the mechanic of it all and the social system etc. But the heroic droid is one of the big pieces all throughout SW. It could work. It's radically different from the other classes which is pretty much where Bioware is going with each of these classes.