Hi, In the usual place: http://www.anandtech.com/show/7085/the-2013-macbook-air-review-13inch He reviews only the 13 inch version. His conclusion is that it's a major update in many ways: Wi-Fi, SSD, biggest 15W TDP CPU with an HD5000. The only compromise is that the CPU offers no performance upgrade: it's almost identical to the previous version. But in return, you get 12 hours of battery, measured at 75% display brightness (previous Apple battery times were at 50%, too). And Mavericks should improve a few things, too. I cannot state it better than Anand when he says: I've been doubting to get an 11" Air or 13" rMBP for some time now. If the latter gets 12h battery time in a slimmer package, it'll be hard to resist.