I'm pretty sure WoW will run at a decent fps at full detail / resolution - especially as I was able to run TF2 fine. Would recommend you take the GPU clock back up to 500Mhz though (it's factory clocked down - save battery life I think).
I was generally getting 3-4 hours (with Skype turned off). Battery life is stated as 5hrs+ i think, but my time remaining prediction only went up that much when the machine was more or less idle.
If you have a use for it, it's a beautiful machine:
http://reviews.cnet.co.uk/laptops/0,...03769-1,00.htm