I don't see any way that is feasible.
Since the PS3 is using a heavily(?) modified PowerPC processor, and since World of Warcraft only supported the PowerPC under MacOS X, and also since the only working version of WoW on Linux, is on the x86 Windows version. I only see a dim (very... may not even be existent, and I just maybe on something) chance it could run using VirtualPC. But even than, I don't think there is a VirtualPC for PPC(if there is, support must have halted since the demise of the dekstop PPC processors. Sorry Amiga guys, I don't think you guys count :/ ), much less for the Cell Processor.