Originally Posted by
Mawhonic
Well basically the mobility for the three specs are as follows:
Arcane: Very immobile. Ice Floes will help you and you have some instants (force nova and you might get presence of mind in a macro)
Frost: Haven't played it for a while, but it's similar to arcane, but has more instant casts with the ice lances, but again ice floes is what makes it more tolerable
Fire: If you want to be mobile, this is your spec. You have the ice floes of course, but you also have Scorch which lets you cast while moving. Take into consideration that you always have some dots ticking so you will always be dealing damage on the move. On Highmaul, arcane is probably the best spec, but on BRF you can go fire on most boss fights. You will be running and jumping around while dealing great aoe damage and decent single target damage. You might want to give this a try and see if it's for you.