Worth noting that when you create a new TPC in TFS 2012, when the TFS configuration DB and other TPC DBs are in SQL 2012 availability groups, the new TPC DB is not placed in this or any other availability group. You have to add it manually, and historically remove it when servicing TFS. Though the need to remove it for servicing changes with TFS 2012.2 which allows servicing of high availability DBs