"Both" is the best answer. However to be able to ask and answer question as well as report problems to a team you must sign up for it. 2. On past test there was a lot of updates that went to people who had not signed up. Not sure why??
It seems like the last couple of Moto/Verizon soak tests were extremely short in duration. Like a matter of days, not weeks, between soak and full blown OTA rollout. (Moto X 2013 for Kit Kat and 2014 for Lollipop come to mind). Let's see what happens after the actual soak goes out!