Rob,
Not yet. The Joomla 1.5 version of JFBConnect has a Kunena profile plugin, but when the Joomla 1.6 version was released, Kunena was incredibly unstable from our testing. We're testing the 1.6.4 version, just released a few days ago, which seems better. If we can get a profile plugin that we're confident with and don't feel would be a nightmare to support, we'll be releasing for that version. With luck, testing, and a release, will only take about a week; however it may take till the end of the month to get something out.
Hope that helps explain the current standing. The intent is to have complete feature compatibility between the Joomla 1.5 and 1.6 versions of JFBConnect in June. Currently, the only difference is the support of a few extra systems (K2, Kunena, and Agora) by the Joomla 1.5 version. K2 and Kunena now support 1.6, whereas Agora has made no announcements about support for the newest Joomla release.