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!
Thanks,
Alex