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Druid
Resto 4pc T10 bonus
The Rejuv doesn't leap off of the target you actually wanted to heal. You just sometimes get a second hot on someone else. It sounds like it was broken on the PTR for awhile, but we're pretty sure it works correctly on Live, and if not, we'll get it fixed.
Shaman
Elemental 2pc T10 bonus bug
We believe this bug only happens in cross-server instances, which is probably why we didn't catch it. While it's certainly not excusable to not be able to use the set bonus when using Dungeon Finder, it shouldn't affect raiding.
There have been a few similar bugs, such as the hunter ability Call Stabled Pet.
We're working on a fix.
Warrior
Tanks in Cataclysm
We expect Prot to still be the talent tree of choice for raiding and the more challenging heroic dungeons since the talents will still probably make them a safer tank overall.
However, making it easier for an Arms or Fury warrior (or Ret paladin, cat druid or dps-focused DK) to step in and tank accomplishes two good things:
1) It makes it easier to get tanks for Dungeon Finder since some dps specs may be willing to slap on the shield (or change forms, etc.) for a faster queue. Based on the current use we are expecting players to use Dungeon Finder a lot in Cataclysm, even in the level up experience.
2) It allows the tanking classes to more fully embrace the fact that they are designed as a hybrid class and they have options available if they are willing to step in and do the tanking.
We're sensitive to Prot warriors not wanting to lose their jobs to non-tanks, but we don't really think that will happen. Right now the main thing keeping Arms warriors from tanking 5-player dungeons is having to get a complete second set of gear where they have to be crit immune. Getting a shield by itself shouldn't be nearly as big of a burden.
