In StarCraft II league play, 2013 Season 1 has begun! Bonus pools and standings have been reset, and 2012 Season 5 milestones have been awarded. You can take a look at your 2012 Season 5 results by visiting the Leagues and Ladders section of the game.
Reminder: the hidden skill ratings used for matchmaking and league placement carry over from one season to the next, so if you were already placed in a league prior to the 2012 Season 5 lock, you'll only need to play one placement match to kick off the new season.
Good luck, and have fun!