I was looking at the cata talents and spells again for my mage.
I noticed that as frost you have a talent to make the Flame Orb spell into Frostfire orb that also slows.
Now I was thinking how about a talent that would make the new Curtain of Frost into a Fire (or frostfire) wall.
I think it would be pretty nice to have a firewall that will burn enemy's and leave a dot much like the fire patches in the first phase of the heroic Northrend beast encounter (bit longer of course otherwise it wouldn't be much of a wall).
In case of a fire wall the slow would of course be removed but like I said leaves a decent dot effect in addition to some damage when a person walks though it like the current frost version.
For single target the damage would not be enough to use it but when there are a new adds in a boss encounter it might be good to use.
(Yes I know we have flamestrike and they would be very similar but I still think it would be nice to have)
Sorry if my English is bad but it's not my native language.