A few suggestions I have for the other mage teams. I've been playing 4mage + priest since WotLK release.

1) Get an IWT button + stop moving button ASAP. Me personally I have IWT on mousewheel forward and move backwards on mousewheel backwards. This fixes any blink issues you'll ever have. You can always arcane barrage or fireblast while IWT is helping you face your target. When I blink a quick roll forward then back on the mousewheel faces all my mages at the target.

2) Get used to arcane missiles. Nothing is more hilarious than having some pillar runner step out into LoS for an instant only to have 5x arcane missiles trained on them. This cast will finish right through a wall if it has to. They cannot escape it and it does massive damage. You can easily kill a geared player in one round of arcane missiles while they hide behind a wall thinking they are clever. + if you proc missile barrage on enough mages that is your highest burst skill period.

3) If you do arena. Get macros to sheep all + slow all. by the time they find a way out of this you've blown at least one person up. I personally open with slow then PoM+Sheep arena 1-4 and then blow all cooldowns and nuke.

4) Get round robin frost nova ASAP. It will keep melee away for a long time. Save blinks for bladestorms or after a good frost nova.

5) Use this spec and tune it how you like. Blizzard is your friend. It puts the 20% healing debuff on all and procs a lot of freezes you can then use for some shattered arcane barrages.