Icehowl can be tranq'd. Seen it with my own eyes.
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Gormok is now the hardest part of the Beasts encounter. However, two tanks are fine.Gormok the Impaler hits harder, and cannot be disarmed. The end result is that he hits much harder, and can gib a decently-geared tank in two seconds on 10-man heroic, once Impale is ticking. Try dedicating more healers to the tanks. A paladin can put hand of protection on the tank with Impale when Gormok goes down, so that Impale isn't ticking when the worms are engaged.If you are levitating when hit with a fire bottle, you take initial damage, but the fire goes out right away. This helps a lot. Bring a priest with the Levitate glyph. Expect Blizzard to fix this.The puddles for the worms are larger, but you have to spread out to keep too many people from getting Burning Bile or Paralytic Toxin. If too many do, that's a wipe. Positioning is critical.Icehowl is no harder, so long as people are able to run away from his charge and you have enough people left alive.On Jaraxxus, put your best tank on the adds. They tend to do more dangerous bursts of damage than the boss, so long as Fel Fireball is interrupted. Let the fireball through on 10-man while the portal or the volcano is up. Don't let it hit the tank in 25-man, though.