Patch 4.0.6 Hotfixes - March 1
Originally Posted by Blizzard(Source)Here you'll find a list of hotfixes that address various issues related to the recently released World of Warcraft: Cataclysm patch 4.0.6. Hotfixes are updates we make on our end without requiring you to download a new patch. Some of the hotfixes below will go live the moment they are implemented, while others may require your realm to be restarted to go into effect. Please keep in mind that some issues cannot be addressed without a client-side patch update. We will continue to update this thread in the days ahead as additional hotfixes are applied. Visit our Bug Report forum for a list of 4.0.6 known issues.

PvPFlag carriers in rated Battlegrounds now take 25% more damage from all magical and physical attacks. The 25% additional damage from carrying the flag stacks with the Focus and Brutal Assault debuffs. Flag carriers in normal Battlegrounds are not affected by this change.
Quest & Creatures
Tol Barad PeninsulaThe quest "Walk A Mile In Their Shoes" has not always been correctly awarding players with quest credit after completing the escort event. This quest is being temporarily disabled and removed from the achievement criteria for Just Another Day in Tol Barad. This fix will require a realm restart to take effect.
Blue Posts
Originally Posted by Blizzard Entertainment
Changes to Ambassador Title in 4.1
If you have the achievement you'll keep the title. The Exalted worked differently because we wanted to move the title to a different achievement altogether (50 exalted).

In this case, if you have the achievement you'll keep the title. If you're close to getting the achievement, you might want to hurry and get it before 4.1 because after 4.1 you'd need to also gain the additional rep to meet the requirements, earn the achievement, and get the title.

Same as it was for Loremaster or Explorer, if you had the achievement you still have the achievement, even though the requirements changed. (Source)

Zul'aman and Zul'gurub
There's a lot of new content in Cataclysm. There's also a plethora of updated content to advance the story.

Likewise, there's plenty of new content still to come in this expansion. But, we're also going to keep moving existing themes forward when the story calls for it. There were specific reasons for originally entering Zul'Gurub and Zul'Aman, but those reasons by no means wrap up the story of the ancient troll empire. These city ruins still serve a major purpose in troll lore, beyond just providing new locations to gain loot.

We're moving the story of the troll nations forward, and hope you recognize and enjoy that. Hakkar and Zul'jin are gone now. Even so, that doesn't make Zul'Gurub and Zul'Aman irrelevant as key locations of Azeroth.