I have a level 71 mage that I am trying to level up before Cataclysm hits. With all the changes to stats I have ended up with nearly 1000 spell power! This is awesome and helps with levelling a lot. I have the chest and shoulder heirloom pieces and my experience is just flying by.
He has nearly 400 tailoring and enchanting which will also come in handy when Cataclysm hits.
I am currently spec’d into frost but with my mana regen and the raw spell power I have, I think that I would be fine spec’d into any of the talent trees. Water Elementals are damn fun pets to have.