We can now remove the display from the lower case.
The 11.6" MacBook Air features a resolution of 1366x768. That's a few more pixels and noticeably more widescreen (16x9 vs 16x10) than the 1280x800 resolution of previous Air models.
The bigger display in the second picture is from the earlier generation MacBook Air. If you look carefully, you'll see that Apple's removed the microphone from the display assembly. The microphone now lives in the body of the computer, right next to the headphone jack.