Das man die Klasse wechseln kann wird hier erwähnt, und ich glaube auch optisch kann man seinen Shepard nochmal einen Feinschliff geben bevor es losgeht.

IGN: I have a soldier class character from Mass Effect, but now that I've seen this Adept video I'd like to switch classes. Is that possible at the start of Mass Effect 2?

Christina Norman: The feel of the classes in Mass Effect 2 is so improved from Mass Effect 1 that we didn't think it was fair to ask players to stick with the same class. While I'm sure you'd enjoy playing a soldier in ME2, I can totally understand you wanting to try out an adept, so yes you will have the option to change your class when you import. We have a story explanation for why your abilities may have changed as well, but I can't reveal that!