Which is a problem. Suppose I want to run an app that I trust, but Apple does not. I'm going to go find the option in System Preferences and turn it off so it stops bugging me, then probably never turn it back on.

It's still months away from release, we might see an option to put trusted certs in the keychain.

There is an option to 'proceed anyway' by right clicking on the app.

Thanks, I didn't see that initially but it's mentioned in the Macworld article.