I don't think it will work, it really depends on what the specs of the integrated graphics card is though.
If it has at least 64mb it should run WoW, it doesn't require a high end graphics card.
If it is a desktop just go buy a cheap graphics card, the AGI Radeon 9200 is only about $30 now, and they're pretty easy to install.
Just update the drivers on the video card before you try and run the game, if it doesn't work, you probably need a better one.