There is no such thing as a typical raid or even a typical encounter, so it is tricky to make blanket statements like "X always tops the meters." Overall, we suspect that warriors are too high (largely on double-dipping effects of Deep Wounds), death knights may be too high, and rogues and possibly cats are too low. This should not be news to anyone who follows these forums.
Again, that depends enormously on your actual group. Players are often very quick to ignore differences in gear or skill when claiming their DPS is too low. We tend to balance around individual encounters though. There might be certain fights where we think say mages, hunters or shamans are too high depending on how that encounter plays out.
When we say "pure DPS classes should generally top the meters" we mean "warlocks, hunters, mages and rogues." However, when we say "generally top the meters" we are referring to players of flawless skill and perfect gear. For almost all raids composed of mortals, a very good player of any DPS spec should be able to do the highest damage on an encounter. This was not the case in BC where we kept say Enhancement shamans or Retribution paladins much lower than the pure classes.
Dual Talent Spec
This is still in the works and we will have more information on it for everyone before too much longer.
Raids & Dungeons
Sapphiron - Aura bugged / not affected by Frost resist?
We've made no explicit changes to the encounter on the design side to change how the frost aura works. When Sapphiron enters combat, he casts a spell on himself that every 2 seconds casts the debuff players receive, which you see as "Frost Aura". That debuff is a 5 second duration damage over time effect that deals frost damage every second. The only difference between the 10 and 25 player versions of these spells is the amount of damage.
So if you were only getting damaged every 2 seconds previously in a 10 player raid, and still are only getting damaged every 2 seconds in a 25 player raid, there's some kind of odd bug going on that I'll have to track down. Especially since the data says you should be taking damage every second.
Once we find out what he bug is and correct the problem, we'll adjust the numbers if needed to closely match the damage that players have been experiencing when Wrath of the Lich King shipped. We're not trying to adjust the difficulty of this fight, but we need to determine what's happening so this bug doesn't cause problems with future encounters.
Sapphiron - not casting all the Ice Blocks he should
We're also trying to track down why Sapphiron decides to occasionally not cast all the Ice Blocks he should.
Malygos: bugs in 3.0.8
We're checking into the various issues noted here, including why his cone breath hits targets behind his centerpoint, issues with malygos deciding to attack in phase 2, and trying to make the defense bubble's protection work even if you enter the bubble in between the time a missile is launched and when it lands.
Malygos: Feign Death not working is "intended"
Feign death not working in actually intentional, but certainly not desired. It was causing a very nasty problem, and we've been trying to figure out a way to handle the particular boundary case without setting the creature flag that ignores feign death.