The OTA is not officially out yet.
The soak test is.
The soak test tends to go to others that are not necessarily on the soak list, giving the impression the official OTA has been released.
Soak tests, 9 times out of 10, are the final build of the software to be released.
It doesn't really matter either way, honestly, b/c as long as the soak test has no issues, the "official" release tends to follow suit very quickly. Soak tests are kinda like new engines in a car. At first you have to take it easy on the engine and break it in, make sure nothing blows up on you in the process. Then after a little break-in period, you can let it fly.