def METHOD_NAME(self):
    """Returns what the new version number would be if approved_for_addon
    was called.  If no version would be signed return None."""
    from olympia.lib.crypto.tasks import get_new_version_number
    version = self.addon.current_version
    if version and not version.is_unreviewed:
        return get_new_version_number(version.version)
    else:
        return None