In Yosemite the App Store System Preferences pane has automatic updates for a few separate items:
"Install App updates" "Install OS X updates" "Install system data files and security updates"
App updates would include 3rd party software as well as Pages, Numbers, iMovie, etc.
I'm not clear on the other two. My guess is OS X updates includes things like 10.10.3, iTunes, Safari, Remote Desktop Client Update, Camera RAW, etc. My guess for system data files and security updates may include things like XProtect definitions, Security Update 2015-001, etc.
Are those assumptions correct?
Would 10.11.0 when it released be considered an "OS X update" and be automatically installed?