This phrase doesn't mean "Wow - Look at all the exotic pets!" like I initially thought. In fact, WoW stands for World of Warcraft which is a multi-player, online, role-playing game. In this game exotic pets are becoming popular, just as they are in real life.
Don't go looking for sugar gliders and coati in WoW. Instead, expect to find things like "Chimaera" and "Devilsaur" kept as pets. There are apparently a total of seven exotic pets available to hunter class of WoW players with the Patch 3.0.2.
Now some of these look like exotic pets that we see in the real world, but I think all seven of these WoW exotic pets can stay in their world. I see no use for Devilsaur - Jurassic Park already showed us why.