The team over at iFixIt has published a complete teardown of the new MacBook Air Retina. While soldered storage and an integrated keyboard count heavily against the device, new pull tabs under the battery and a separate logic board for the dual Thunderbolt 3 ports make some components easy (well, easier) to repair. Overall, the MacBook Air Retina scored a 3 out of 10 for repairability.
https://www.notebookcheck.net/The-MacBook-Air-Retina-is-slightly-more-repairable-than-Apple-s-other-laptops.358366.0.html