At the time of writing this post there are 21 hours left until the Wastelanders update! GET HYPE!
This thread will serve as a hub of all the info that comes out prior to release.
Steam Release
The Steam version is available for preload! If you linked your Steam account to your Bethesda.net account before midnight EST last night should have Fallout 76 in your Steam library available to be downloaded!
Release Time
Bethesda announced via Twitter the launch times for Wastelanders in a few timezones. The maintenance will begin 5 hours prior according to the Bethesda.net forums. Make sure you check this Tweet so you know when to set your alarm to!