The RAM is soldered in but the SSD is not. For the 2010 and 2011, OWC had available replacements, and they are planning to make replacements available for the 2012.
Also note that the MacBook Pro with Retina Display also has soldered RAM and a proprietary SSD like the Air, so that is definitely the direction that Apple is headed in the future. In general, the concept of "future proofing" is giving way to planned obsolescence, and it isn't just Apple headed in that direction. Microsoft is clearly headed there with their emphasis on the Surface and Surface Pro (which are definitely not user upgradable). Granted, because of their significant enterprise background, they probably won't become as completely closed as Apple, but they may get close. Desktop exists in Windows 8 (but not Windows RT) solely for support for legacy applications, and it is losing some of the UI features it gained in Vista and 7. They want people to code for Metro.
This post has been edited by KPOM: 30 June 2012 - 10:10 AM