iFixIt has announced it has completed teardowns of both the new MacBook Air and the new Mac mini.

Comments from each model include:

"Although today is an exciting day for Apple, it's a sad day for consumer repair. Apple decided that this "svelte and sexy" MacBook Air will replace the "simple and serviceable" white plastic MacBook. So while your backpacks will be significantly lighter, future repairability and upgradability will suffer tremendously. Unlike the plastic MacBook, the Air has a proprietary SSD, soldered (non-upgradeable) RAM, and replacing the LCD panel on it is incredibly challenging. Hence it received the same dismal 4 out of 10 repairability score as the previous-gen Air."

"This year's Mini is a great example of "less is more." Apple has done away with the optical drive and replaced it with some good old-fashioned emptiness. We found that hole (as well as the empty extra SATA connection on the logic board) to be perfect for adding a secondary hard drive -- essentially bypassing the $400 premium over the "server" model. The only snag in this master plan is being able to find another hard drive cable to hook it up to the logic board, something we'll work on sourcing. Kudos to the Mini for receiving an excellent 8 out of 10 repairability score. There's no proprietary screws or glue, and you can easily replace the existing RAM and hard drive (or almost any other component) if needed."

The teardown:
http://www.ifixit.com/Teardown/Mac-Mini-Mid-2011-Teardown/6131/1
http://www.ifixit.com/Teardown/MacBook-Air-13-Inch-Mid-2011-Teardown/6130/1