I just ran across kb 1026944, titled "Restoring VMware Consolidated Backup images on vSphere 4.1." This kb article discusses that while VCB support is included in vSphere 4.1, restoring a previously backed up VCB image will require the use of vCenter Converter Standalone 4.0.1 or earlier. This is because the VCB restore capability is no longer available in vSphere 4.1, vCenter Server 4.1, and vCenter Converter 4.1. So if you have older VCB backups that may have to be restored into your vSphere 4.1 environments, make sure you have a copy of vCenter Converter Standalone 4.0.1 or earlier available.
Thanks for reading!