Blue post regarding Wizard channeling and the initial cost. Looks like the nerf is going away and they are actually going to add some type of implementation that the longer you channel, the more damage the skill does which sounds good.
"I don't think our philosophy quite matched up with the actual changes that took place. Channeling spells, as the name implies, should be most effective when time is spent channeling them for a few seconds.
We recognize the additional Arcane Power costs we implemented in the initial 2.1 PTR didn't accomplish this goal, but rather disincentivized using these skills. In the next PTR, you'll find we've removed the upfront Arcane Power cost from Arcane Torrent, Disintegrate, and Ray of Frost. In addition, the damage these abilities do with now scale upward over time, rewarding you for spending additional time channeling.
These changes more accurate portray our design intent for these skills - that the longer you channel, the more reward it brings. Let us know what you think, especially once we patch the PTR and you can give these changes a try in practice.
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Call my pessimistic however, but I have a feeling they may nerf the initial damage dealt before the scaling starts, which will be terrible aswell. This just seems to be the way Blizzard works in that they don't even know their own game or their own players...
Incoming monk zDPS & Shatter build nerf!!
"I will echo the sentiments of others - this is why we have PTRs. A huge thank you to everybody who has been helping us test rifts thus far. Our internal testing team identified a number of skills and items to keep an eye on and Exploding Palm, Rimeheart and the Furnace were all on the list. The dedicated players on the PTR have shown what is possible when the game is stretched to the limits.
We're looking to make changes to Exploding Palm in the next PTR patch. Of the three (Exploding Palm, Rimeheart and the Furnace) we feel this is the biggest offender. It's not clear if Rimeheart is as offensive if you're not able to further transfer the resulting damage onto elite monsters via Exploding Palm."