I'm telling you how it is because I just did it myself, in App Store -> Software Update the update was there asking me to install it. There are options in App

I'm telling you how it is because I just did it myself, in App Store -> Software Update the update was there asking me to install it. There are options in App Store system prefs panel that let you change the default behaviour. That being said, there's no reason why this shouldn't be applied automatically.