Looks like this PTR beta build (as of this post), mages haven't been hit with the Pyro CD yet (remain vigilant!) What has happened instead is the following so far:
I guess shrinking the window of "pumping pyros" into deep'd targets is one alternative. I wonder what else they have up their sleeve...
- Deep Freeze duration DECREASED from 5 to 4 seconds.
- Frost Bomb time to explode (outside of Glyph of Fire Blast Trigger) INCREASED from 5 to 6 seconds.