The official announcement will be made on Monday. So far, this date is on Ticketmaster:
The Regency Ballroom San Francisco, CA
Mon, 02/06/12
07:30 PM
And, if you go here: https://tickets.axs.com/eventShopperV2.html?wr=6e646a39-7c93-4afe-a9cc-0169a525300d&skin=regency Trivium is also mentioned.