Armor Penetration
Armor penetration as a concept is not overpowered. We're not worried about Sunder Armor for example. Armor penetration as a stat was overpowered. There was no reasonable mathematical way for us to prevent armor pen rating on gear from just being better and better the more you stack, which has a number of problems, such as making other stats unattractive and making a dude with a lot of armor pen overpowered. (
Source)
PvP Damage
Some of those numbers have already come down. If you recall, Fury dps was low with the patch, so we buffed it, knowing that we would have to nerf it again to keep it under control at 85, especially with Colossus Smash and Deep Wounds. Ret had a similar issue with Inquisition.
We definitely want to increase survival time in PvP relative to what it was in Lich King. We are considering increasing resilience at 85 or even bumping health pools across the board even more. (
Source)
Rogue (
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Cataclysm Talent Calculator /
Beta Skills/Talents)
Vanish in Cataclysm
The purpose of Vanish in Cataclysm is to get back into stealth. If you want to avoid harmful effects, use Cloak of Shadows.
We grew tired, as did many players, of "Vanish never works LOL" so we looped back to the original intent of Vanish being about stealth. That is why the tooltip specifically says that harmful effects won't break Vanish, but does *not* say that the harmful effects won't land. We understand some rogues liked using Vanish to "dodge spells" but the ability was never designed to work that way and never was going to work that way very well. The more we tried to let it be a damage negater, the harder time we had letting it guarantee stealth.
There is a current live bug with pets and guardians being able to still target a vanished rouge. That will be fixed in an upcoming patch. Other than that, we are not aware of any issues that keep the ability from working as advertised. Most concerns seems to be rogues who want it to work a different way. (
Source)
Warrior (
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Cataclysm Talent Calculator /
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Colossus Smash
The origin behind Colossus Smash was that we realized warriors were at a disadvantage against heavily armored targets because they do no magic damage. We also wanted to put something in their rotation that was more than just another +weapon damage or +AP attack. Finally, we wanted to replace Execute in the Sudden Death talent, since that was keeping Execute's damage low, instead of it feeling like a powerful finisher. (
Source)