I just read that the Loot patch is planned to include the class changes prior to lvl70 for vanilla D3. So we can expect the new Frozen Storm perhaps on March 18 based on the AH closing.
Have you tried Malakai's Black Ice build? I've never seen huge mobs blow up as fast as that - it's especially crazy when an elite is stuck in the middle and they die in a few seconds.
I use Blizz/Snowbound to round up the mobs simply because I can get ones on edge of the screen easier. Beyond that I think they would be about the same as Blizzard is nice roundup because it slows fast mobs in FoM so they are moving after you slower and gives you some nice life steal while you get a REALLY huge group together.
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