XenForo Portal
1. Need to setup a XenForo site that is visible to the public.
2. Import current vB4 site into that site.
3. Temporarily, have existing forums redirect to the vB4 forums & threads (except admins).
4. Finish testing items that can only be properly tested in live, full databases. Use the portal for development and testing from now on.
5. Sync XenForo and vB4 databases to each other, so that all new users/threads/posts/etc from either are added to the other. This item may take some time.