I have watched the posts on gaming and the MBA 2nd Gen..
I find it curious that folks are fretting sooo much over the ability of the new Air to the old Air.
I play WOW, and have for over 4 years and mostly on MAC's. My MAC Pro handles the bulk of this play.
Realize that gaming and MAC's has and is still limited to some degree. The gaming has improved in the past couple of years, but for hardcore gaming or even above casual there is some distance to the Windows world.
The gap that still exists is multi-layered. There is the machine and the components, the operating system and the game vendor.
Right now the machines are very capable of playing the games, the operating system is coming right along and Apple has improved the OS for this part of the equation. The game makers are working at improving the MAC world and gaming, but they are behind and with MAC's still only representing a small fraction of the gaming market it still doesn't have their full attention. Take a look at the posts from Blizzard about making WOW more compatible with Lion. They will get to it, but it isn't causing an "emergency" patch to be released. The reason is that the MAC share of Blizzard gaming community while it is grown is not big enough yet.
WOW plays fine on my new MBA 13" but in dungeons or intense PVP there can be some issues with FPS or lag (Really very minor). Last night since I was traveling I finally put the MBA to the full test and walked away satisfied. Not one time did I think my MBA caused my loss in PVP, it had more to do with my gaming skills.
I did find the limitation of the 13" (Glad i chose the 13" over the 11") screen and playing my new healer with all the add ons versus my 24" monitor at home more of an issue.
Did I have the settings at full on? No
Were the graphics good enough? Yes
It is all about your priorities. My MBA is about work and portability, and having the ability to play WOW knowing the limitations of my MBA works for me.
Very happy with my MBA 13", running Lion and look forward to any improvements either from Apple or the game makers to the gaming experience on the MBA which is the future mobile of computing IMO.
Kimbermatic