In the Roster Vault, there is a roster called "WBC 2013 All Team" (uploaded by user CalebJCortez) on Feb 23. Though I noticed he seemed to take some creative liberties (i.e. Ichiro is on Team Japan in his rosters, but not in the actual WBC), the rosters are fairly accurate. I made a mapping of the WBC teams in his roster, to the MLB teams they were assigned in the game.
TOR - Canada CLE - Puerto Rico KC - Italy MIN - Chinese Taipei ANA - Spain OAK - Mexico SEA - Australia TEX - Dominican Republic WAS - USA NYM - Brazil PHI - China CIN - Cuba MIL - Japan ARI - Venezuela LAD - Korea SF - Netherlands
Grab the roster while MLB 12 is still online! --- Now playing: MLB 12: The Show, GTA IV, Mortal Kombat Now anticipating: Dead Island: Riptide, GTA V, Metal Gear Solid: Ground Zeroes