Couple things you should be aware of;
The training spots you may have had have changed significantly, monster levels have changed. For every level a monster is higher than you (Not sure if that makes sense) there is a 5% increase to "miss" on that monster (someone check my facts).
A lot of the skills have changed, there should be a thread on that somewhere in the forum.
Bunch of FM changes.
Hope that sort of helps, I've been MIA as well.