Dave,
Google+ authentication will be implemented in JFBConnect v5.1, which will be out in August. Later this year, we'll also be implementing Twitter authentication.
We will not be providing OpenID integration with JFBConnect and instead using the Google+ Oauth2 authentication API's. Just wanted to point that out in case OpenID is somehow a requirement for you.
I hope that helps, but if you have any questions or feedback, just let us know.
Thanks,
Alex