Sure did... spent 30-35 minutes at an Apple Store this morning on the 13" MBA. Sorry, no feedback on the 11" model as the screen is unacceptable for WoW (my standards).
At Fair settings across the board I was looking at 24-44 FPS while doing Molten Front dailies. At Good settings across the board it held steady at 25-31 FPS while over in the Furnace (Molten Front dailies). I was unable to get a raid/5-man going so I jumped in on an AV. At Fair settings across the board, same (24-44), at Good, same (25-31).
Of note, when killing Galv (on Good) with all of the various spell/particle effects it dipped to 12-14 FPS. I back capped and played some D, so protecting the dwarf and the chaos there also had FPS dip into the low teens (10-14 FPS).
I suspect if you drop it down from Good (to Fair or Poor) you'd get the extra "oomph" to 25-40 FPS. Certainly not a machine that I'd want to be in a Top 15 progression guild using and trying to run FRAPS. But definitely playable and enjoyable for 99.9% of the WoW population like you and me.