Don't get me started... what I want most is an MBA without a bezel. Hell, I could be happy about the Intel IGP if I had ZERO BEZEL with it. That is one feature that really bothers me currently, as I feel like my 13.3" MBA should be a 15" MBA and the 11.6" should be a 13" model. It is waste and it really affects the overall appearance negatively and adds us carrying more than we need to in regards to the footprint.
I have to believe Apple does this in all Mac notebooks to allow more space for battery and such. Can you imagine selling 13.3" MBAs the footprint of 11.6" MBAs? It would require more to drive the larger display in the same space for battery. it probably comes down to that mostly and maybe some cooling as we wouldn't want ULV CPUs in 13.3" MBAs - although that could happen anyways to give it even more battery life. All of the rumors mention ULV and not LV like the current 13" MBA has.
I do hope the 2012 MBP updates include elimination of the bezels, optical drives, and Intel IGPs. A 13" MBP at 1" thick, with a black liquid metal case, IPS 1440x900 display, and a real GPU would make me migrate back to the MBPs. I feel the current MBP is a waste for several reasons, as it's a waste of space for an antiquated/outdate optical drive, it has too low of a resolution on the display, and the "Pro" moniker with Intel's HD 3000 is a joke! Use that space to add battery and a real GPU! Fix those problems and eliminate wasted space for the bezel and I am all in for the switch.
In addition, I think it will be two more years, minimum, before Apple refreshes the design of the MBA. The timeframes Apple follows are usually three years or so... sometimes a little more sometimes a little less. We have had the same MBP since October 2008. Therefore, I think there's more hope for things like elimination of the bezel with the next MBP. I hope I am wrong and the 2011 MBAs include elimination of the bezels in favor of larger displays in the same size MBAs.