Like it usually happens when Blizzard announce new stuff, players tend to raise their concerns over announced changes. This discussion was inspired by the recent developer chat on twitter, and original post can be found on the Tanking forums (US).
Just for clarification, since some people were confused before: I will be marking quotes GC decided [...]

Quote from: Blizzard Staff

Cataclysm Class Preview: Warrior
World of Warcraft: Cataclysm will bring with it several changes to class talents and abilities. Here you will get a glimpse into some of the changes we have in store for the warrior. The information you’re about to read is not complete, and is only meant to act as [...]

Quote from: Zarhym

We recognize that many plate tanks are making their gear choices based on the amount of armor they’re provided, as this is currently the most preferred stat. In order to make the tier-10 plate tanking sets more desirable, we will be adjusting the stats on the gloves and chest pieces in order to [...]

Mr Greg Street, aka GhostCrawler – Blizzards lead Systems Designer – took the time to comment on Warbringer nerf, in his usual style, commenting on a topic about it on the official wow forums. We will be updating this article in case of any further posts on the nerf.

Quote from: Ghostcrawler

I always struggle with [...]

Quote from: Ghostcrawler

Without a defense stat there should not be a huge gear requirement to tank 5-player dungeons. It would be ideal if say an Arms warrior could go Defensive Stance, maybe use a shield, and be able to fill the tank role in any normal dungeon or even the easier heroics.
You will still likely [...]