Im confused. I see at 60, there is only one faction and all classes are within that faction. Does this mean a sage and sorcerer can group together? or am I lead to be confused on purpose seeing as all those classes in one faction?

I ordered SE before my CE which was just one day apart.. My CE wasn't accepted in the first two waves but my SE was.. MY question is, Could I just use the SE to play now, and then when the time comes when it asks to put in my CE Code at launch,will this work?