Of note this time around is Blizzard's tough time dealing with tanks wanting threat stats (hit and expertise) and the current struggle with making it work. Currently, in cutting-edge content, threat stats are pretty good for initial aggro, but over time, Vengeance does its job admirably and keeps bosses on tanks with relative ease. I think that design decision is hitting the sweet spot, but it begs the question of why even have the threat stats in the first place?
Blizzard also discussed the mastery bonuses for each tank. The devs feel that death knights and druids are doing pretty well, all things considered, and that paladins and warriors have a similar problem in "capping" mastery, but that paladins are more susceptible to problems. There is still the sentiment in the community that Blizzard needs to add its own visual threat meters or some type of aggro status, but there is a reluctance on Blizzard's part to clutter up its own default UI -- understandable, but this may potentially be a part of Blizzard's forthcoming (but not discussed) "how to tank" solution.
Buried in this discussion, however, was a little tidbit about patch 4.3. Blizzard states that the design for the patch 4.2 legendary, Dragonwrath, has wide appeal to a number of staff-wielding ranged DPS classes. However, it then mentions the "patch 4.3 legendary" and its more narrow appeal. Will we be seeing a tanking legendary in the near future, or potentially another healer item? We do know for sure that it will not be as widespread, class-wise, as Dragonwrath, so we can only sit back and assume. What is interesting, though, is that patch 4.3 also looks to be a raid tier and not a patch 4.1-style dungeon content update. Could patch 4.3 be bringing us the War of the Ancients raid that we have been eagerly anticipating, especially with the return of Nozdormu and his crazy time antics? Only time (heh) will tell.
Also, don't expect a new tanking class any time soon. Hit the jump for the full question and answer session.