If you report problems, at least mention in the OP that it's the beta. Otherwise, an unsuspecting member might say "I can't find SOS on my AW running wOS 2.2" or dig up this thread from the graveyard once wOS 3 officially debuts disputing that SOS causes battery drain.
I had turned off SOS but didn't restart so I restarted last night - will be keeping an eye out - I'm still dropping around 5-10% each hour. I have a 38 MM so I never got the battery life of folks with the 42 MM but I could usually make it through a day. I'm watching to see if the restart helps today. Before I would average 3% per hour on Watch OS2 and OS1.
I never turned off SOS, my watch just finally after a few days regulated and I get basically the same battery life as I was getting on OS 2. Put it on at 8:30 am today and I am currently at 20% at 12:30 am. I have SOS on, screen at maximum brightness, and prominent haptic notification is on. I am finally happy!