According to http://www.techreport.com/discussions.x/13721 and somewhat confirmed by AMD:
More updated info: http://www.techreport.com/discussions.x/13724An industry source at a tier-two reseller told The Tech Report that the TLB erratum has led to a "stop ship" order on all Barcelona Opterons. When asked for comment, spokesman Phil Hughes said AMD is shipping Barcelona Opterons now, but only for "specific customer deals.