"Obviously it's just too early to say the wizard does or does not have mana issues, that all comes down to balancing and fine tuning, and ideally of course the goal is that each class is very playable and not frustrating. Especially at early levels.
Mana orbs are actually the product of a passive skill in the wizard's arcane tree. Since we can't guarantee people will get that skill I don't think it can ever really become the deciding factor in mana regen. It is an early skill in that tree though, easy to pick up, and sure to be helpful."