Oh No!

Many users have noticed a huge decrease in their audio quality since the new patch, due to the way the voice chat was implimented. Creative posted the following in their forums:

As many Creative soundcard owners are discovering, Blizzard recently made changes to the WoW client that have impacted the audio experience significantly. Our developer relations group were given minimal advance warning that these changes were about to occur, and our subsequent requests to Blizzard for clarification as to why the changes were made have gone unanswered.

You can read the rest here.