Apparently it can play the full PC version of WOW. They couldn’t log on to the American servers and show gameplay unfortunately, but it looks like the real McCoy.
They also demoed the device running Quake III Arena up to a staggering 120 frames per second! They claim that the device would be able to do this for a whole consecutive hour, which is quite good considering the CPU power it would require.
Go check out the entire article at Engadget for some actual vid clips.