WHMCS Multisite Provisioning Plugin - Current Members

When the WHMCS Multisite Provisioning Plugin is released, will it be possible to automatically add the current members to WHMCS, with their current settings?

I'm ready to go live, and have ProSites set up, but want to know if it would be better to wait for the release of the plugin, or just to go ahead with proSites, and then add everybody once it is released.