This Pyroblast cooldown is seriously depressing. Fire already lost some of it's awesomeness, now that you have more control over the Pyroblast! procs and it's no longer a surprise when you get it. It does fix the crap RNG part where you can go 50 Fireballs without ever getting two crits in a row. So, overall, the MoP Fire Mage > Cataclysm Fire Mage. Actually just found out an amazing combo for Fire using Alter Time and Presence of Mind. Awesome for PVE and I guess overpowered for PVP. But Jesus, a cooldown on Pyroblast? This is not the way to nerf Fire Mages. I'm not happy about damage reductions, but if a nerf is really required, for f's sake, lower the damage increase on Pyroblast! to 15% or something.
I haven't been having a lot of fun on my Mage, ever since Cataclysm was released. Just today I started to love it again, using that new awesome combo with Alter Time and Presence of Mind, only to be heavely dissapointed again after reading the 5.1 patch notes. The combo is dead. As rare as two Pyroblast! procs in a row are, now we won't even be able to use them quickly anymore either. This will break Fire Mage. If this goes live, I will bench my Mage.
Of course, it's not set it stone, but the fact that Blizzard is considering a f'ed up nerf like this, shows Fire Mages are in trouble.