Yeah, I was part of the .902 update test. There is no guarantee that you'll be selected, but if you do you'll get an email saying it'll be out. then you'll get the update OTA. After a couple of days you get a survey to fill out (the OTA update goes out after that) and one later on. Part of the soak test is the ability to receive and update OTA, not sticking it in your SD-EXT card and booting into recovery. If all goes well, the version sent on the soak test will be the version that goes OTA.
The thing is that you agree not to disclose anything on forums such as this. That should include "I'M ON THE SOAK TEST AND GOT THE UPDATE! dancedroid:icon_ banana:" threads.