That's got an integrated GPU, so it's not going to play WoW very well - it definitely won't max it out. Depending on what power supply it comes with, you might be able to add a decent GPU to it.
Also, I really wouldn't trust any retailer who adds this to their specs:
STANDARD 2.8Ghz Per Core = 11.2Ghz Total Power
OVERCLOCKED To 3Ghz Per Core = 12Ghz Total Power
It just doesn't work like that, so they obviously have no idea what they're talking about.
This would be a much better idea:
It's cheaper, newer, but if you're wanting to play WoW at max settings you'll definitely want a bigger budget (£5-600 at least).
and this would be a good choice of graphics card: