Well...after my restart last night to fix frozen Snapchat messages, phone started updating over 40 apps, got hot, burned through half the battery in less than 20 minutes.
Did another restart after everything was downloaded and fully charged overnight. Now it seems as though my draining issue is "fixed"...phone is still at 100% despite typically still burning power when plugged in the car charger and using Apple Maps. And has been off charge for 1/2 hour now and still at 100%.
We'll see how the rest of the day goes, but this has been the typical scenario with me and betas...always fixes itself within the first week.