Apparently several Canada dates have been added:
More dates have been added to this summer's Unholy Alliance Tour, featuring headliners SLAYER with support from LAMB OF GOD, CHILDREN OF BODOM, MASTODON and THINE EYES BLEED. The tour kicks off June 6 in San Diego, California at the Sports Arena. The dates are as follows:
Jun. 06 - San Diego, CA @ The Sports Arena
Jun. 07 - Las Vegas, NV @ The Orleans Hotel and Casino
Jun. 09 - Denver, CO @ Th Fillmore
Jun. 12 - St. Louis, MO @ Pop's Blue Moon
Jun. 13 - Chicago, IL @ Aragon Ballroom
Jun. 15 - Camden, NJ @ Tweeter Center at the Waterfront
Jun. 16 - East Rutherford, NJ @ Continental Airlines Arena
Jun. 17 - Lowell, MA @ Paul E. Tsongas Arena
Jun. 19 - Cincinatti, OH @ US Bank Arena
Jun. 23 - San Antonio, TX @ Freeman Coliseum
Jun. 25 - Houston, TX @ Reliant Arena
Jun. 30 - Cleveland, OH @ Tower City Amphitheater
Jul. 02 - Quebec, CANADA @ Centre de Foire
Jul. 03 - Montreal, CANADA @ The Bell Centre
Jul. 04 - Toronto, CANADA @ Molson Amph
Jul. 06 - Detroit, MI @ Cobo Arena
Jul. 07 - Milwaukee, WI @ Eagles Auditorium
Jul. 09 - Winipeg, CANADA MTS Center
Jul. 11 - Edmondton, CANADA Shaw Conf. Center
Jul. 13 - Vancouver, CANADA Qwest Field Event Center
Jul. 14 - Seattle, WA @ Qwest Field Event Center
Jul. 15 - Spokane, WA @ The Star Theatre
Jul. 16 - Salem, OR @ Salem Armory
Jul. 21 - Mesa, AZ @ Mesa Amphitheatre
Jul. 22 - Long Beach, CA @ Long Beach Arena