Edit: Scratch that. Blizzard fixed the problem a completely different way.
"As far as a PvP- snare ability goes, we are going to try something like removing the cooldown and root from Chains of Ice. It will drop the target's movement to zero, and the target will regain 5% movement speed per sec for 20 sec (10 in PvP). It's a physical debuff that cannot be dispelled and isn't subject to diminishing returns. Let us know how it goes. If it's too spammy now, we can put a cooldown back on it."