Unfortunately, we do not have a schedule yet. We are currently working on complete support for Joomla 3.7 Custom Fields as well as fixing some other nagging problems. Once that is done, we will sit down with the list of V2.2 items and decide which to implement when.
That is the best answer I have....but it will probably be at least a couple of months.
You absolutely did not upgrade your Joomla too early! You should be running Joomla 3.7.2 on all sites.
JoomFuse supports Joomla 3.7.x, but we cannot yet map the new custom fields to Infusionsoft fields. That is coming very soon.