Interesting posts by BLUE:
http://forums.worldofwarcraft.com/thread.html?topicId=8765643774&sid=2000Threads have popped up in several class forums that seem to be converging on a few of the same issues. So rather than cross-posting a lot, I thought I would start a new thread.
Tanking design:
1) Our goal in Lich King is for all 4 tanking classes to be viable.
2) We would like for tanking to be a little more fun. I'm going to leave this vague on purpose, but it is definitely a concern.
3) In 5-player instances, most warriors, druids, paladins and death knights should be effective tanks. The healing specs may have a harder time than the dps specs. Arms wariors, Fury warriors, Ret paladins, Ferals and most DKs should do fine.
4) In 5-player heroics, the expectation is that the tank has a heavy investment in tanking talents and appropriate gear. Arms warriors might have trouble tanking a heroic unless they overgear the instance.
5) For raids, we want all 4 tank classes to be viable. If your group has e.g. a Prot paladin and Feral druid as main tanks with appropriate gear and reasonable skill, you should be good to go.
6) This is a shift in philosophy for us. Previously, we sometimes tried to steer Ferals as being better off tanks than main tanks. We also expected specific classes to appear in the raid. Our new assumption is that you might have any of the 4 tanking classes as a tank. We are trying to achieve as much parity as we can among the 4 tanks without making them too similar.
If nearly all guilds want the same class as their MT, we've failed.7) This is a big one: the game isn't finished. We aren't spending too much effort yet to make sure mitigation, threat and tools are similar across the 4 classes at level 80 in blue or purple gear. Likewise, your talent trees and core abilities aren't finished. Tanking (and PvP) need to have a lot of other pieces of the game in place before we can really get the numbers right. It's fine (useful even) to point out when you feel a particular ability, talent, class or build is too good or not good enough. But please don't infer the work in progress as a reflection of our intent. If we end up changing our minds or if things don't work out, it will be posted here.
8 ) There are a lot of changes in Lich King that change tanking and raiding in general. I won't list them all out here, but keep in mind things like itemization changes, widespread raid buffs, consumables, UI changes, etc. Just keep them in mind. We're not in Tempest Keep anymore.
http://forums.worldofwarcraft.com/thread.html?topicId=8765643774&sid=2000&pageNo=2#28We would still like to have tanking "flavors" as you put it, but I want to be a little careful when I say that because some people have taken that to mean that their class won't be good enough to tank the content they want.
If druids had gigantic health pools but lower mitigation and avoidance than a warrior, that would be tanking flavor. It would mean you heal the bears a little different -- they might drain more mana, but the damage would be more predictable. In really long fights, the warrior might have an advantage. In a fight where a boss hit quickly for less damage per hit, the warrior might have an advantage. In fights with periods of really big damage, the druid might have an advantage. In magic fights where armor was less of a factor, the druid might have an advantage. This is just an example.
Our overriding concern is making sure the tanks have the tools, threat and mitigation they need to tank. A secondary concern is making sure they don't feel too similar. 
