I'm excited about revamping the skill system. I'd like to see a fifth skill slot because I tend to use 5 skills on all classes so that I am versatile in pve and pve. Even a new skill for each class seems interesting. However, I assure you that whatever it is people will find something to complain about.

And I don't see why many rogues complain about mana. It's not that hard to pot and pots aren't that expensive. If you're having trouble with this then maybe you should look for a new game.