Mage Pvp info needed

[a C e]

I wanted to go back to pvp since my pve guild is going to raid casually until 5.2 , i heard there is a nerf to Deep freeze coming soon.
Is that true ?
what other nerfs are we going to face ??

I know i can read the patch notes but i need better clarification and i am lazy :P

[SpaceDuck]

DF is now a 4 second stun instead of 5 (changed in 5.1). they were gunna make it so DF is removed on damage but that change never made the PTR patch