Nothing that I know of. You could test it out...make sure absoutely nothing else is running other than World of Warcraft, then when you start up WoW make sure ALL of the graphics are set to as low as humanly possible and maybe set the Macbook on a hard, cool surface and see what happens?
Other than that, do a little more googling and see if you can find any more information. Also, contact Blizzard and Apple.
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