JFBConnect v4.3 is on deck and should be out next week. That's a very large release and consuming everything from us right now.
The JLinked v2.0 will be worked on after that is out and will be a Joomla 2.5/3.0 only release. Joomla 1.5 will no longer be supported. v2.0 will also add the automatic registration capabilities of JFBConnect so that you can have a friction/form-less registration process. Our goal is to have it out in January sometime, which seems pretty realistic.
Hope that helps, but if you have other questions, just let me know!