Yeah, we screwed up on our timing estimate. The Comments Content plugin was pushed back for the 3.1 release to enable wider testing with the new release. Unfortunately, that version isn't expected out until the end of this month.
We have a mostly working (but not fully tested) version of the plugin ready. It should be fine with the 3.0.x versions of JFBConnect. We'll look into doing a release next week instead of waiting for the full 3.1 release for it, since you probably need it 'now'. The 3.1 release will also have (or shortly thereafter) content plugins for the other relevant widgets to an article (mainly Like).
Sorry again, and we'll post here when something's available.