Classes changes

Blizz forum is weird, so i have no idea where this post will end up.

So i am worried i am gonna be forced to put a fire spell with Mages into my rotation for my frost mage. When SL was announced way back when i wasnt happy with that idea, from those who have tested it, are we being forced to use Fireblast in our rotation for maximum DPS? or any other fire spells for DPS or survivalbility.