Because of this announcement, I decided to update my Community Auth application for use with CI3. Updating was pretty easy, and I decided to change Community Auth quite a bit. It's no longer going to be supplied with an example application, except for the essentials. I'm also putting it all inside of a third party package, so it'll be easier to drop into an existing application.
New repo is currently locked, but hope to be finished within a week, and then I'll unlock it.