A more portable laptop noticeable lighter
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Thinner might be a problem.
Maybe you should go with a Samsung then..
They could've put a quad-core CPU in the 13" but didn't, to make more profit from it. Get the 15" rMBP if you want value, or the 13 rMBP if you can afford paying extra for nothing.
Or as said; go with a windows-brand. It's not only about the hardware, but OSX. I've always used OSX and that's pretty much my only reason to buy macs.
I am not getting any of them. Not before Haswell comes out. I am not even talking about my own laptop wishlist.
From a business perspective, though, it is a hard call for Apple to justify a non-retina display on the MBA when the premium ultrabooks are getting high-resolution IPS displays. The MBA may be considered a lower-end ultrabook in a few years if it fails to evolve to leave room to the rMBP.