Deathy's identity crisis will be over before Cataclysm, according to Nethaera. His days of thinking he's Grunty the Murloc will be over once he goes through "rehabilitation" of some sort. Judging from the words Nethaera uses, Deathy will be fixed in patch 4.0.3.
For those of you who attended or watched BlizzCon 2010 and claimed a Deathy pet, you may have noticed that he's acting strange. In fact, he seems to think he's Grunty the Murloc Marine. This is an unintended consequence of the groupthink from which all murlocs suffer. Deathy will be undergoing an extensive rehabilitation program and should be acting appropriately destructive once his idol, Deathwing, shatters the world in an upcoming patch that will debut prior to the release of World of Warcraft: Cataclysm.
BlizzCon 2010 is over! WoW Insider has all the latest news and information. You'll find our liveblogs of the WoW panels, interviews with WoW celebrities and attendees and of course, lots of pictures of people in costumes. It's all here at WoW Insider!