The big thing looks to be mixing in a moonkin with Earth & Moon for fun times.

A mage cluster has potential. Blast Wave knockback, for one. Living bomb is meh solo, interesting with a 3x or 4x cluster. Frost...85% chill Blizzards with crits are funny, but tricky to set up multibox. I think the main GTAoE trick is to use Keyclone on a single box & set it to focus on the one the mouse is over then do some fast clicking...imprecise, but moderately effective.

Also, Ret seems to be the new Prot. Or something like that.