Depends on each person I guess. Personaly I will most likely only play with one character, I'll play through the content availible and hit max level is feasible. Play around with the systems, economics etc so I know how it all works for release. I wont run around looking every single thing up though, or replay the starting experience with all three classes. Also, the fact that there's a month and a half between Beta and release helps you forget a lot of minor details,