2013 Box Office so far:
Domestic Grosses:
1.  Identity Thief  -  $120,587,000
2.  Oz The Great and Powerful  -  $114,214,000
3.  Mama  -  $71,182,525
4.  Safe Haven  -  $65,294,000
5.  A Good Day to Die Hard  -  $64,649,000
6.  Warm Bodies  -  $64,010,910
7.  Hansel and Gretel: Witch Hunters  -  $54,580,844
8.  Escape From Planet Earth  -  $50,464,000
9.  Jack the Giant Slayer  -  $49,443,000
10.  Gangster Squad  -  $45,887,098
Worldwide Grosses:
1.  A Good Day to Die Hard  -  $241.6 million
2.  Hansel and Gretel: Witch Hunters  -  $197.1 million
3.  Oz The Great and Powerful  -  $184.1 million
4.  Identity Thief  -  $122.8 million
5.  Mama  -  $112.9 million
6.  Gangster Squad  -  $99.1 million
7.  Warm Bodies  -  $92.8 million
8.  Jack the Giant Slayer  -  $72.0 million
9.  Safe Haven  -  $65.3 million
10.  From Up on Poppy Hill  -  $60.0 million
This list doesn't include Journey to the West: Conquering the Demons which has made $202 million, but has openly opened in a few Asian nations.  
I'm happily surprised at how well Mama has done, and utterly shocked at how successful A Good Day to Die Hard and Hansel and Gretel: Witch Hunters are.  International appeal does wonders I suppose.  2013 won't be a record breaking year (just wait until 2015), but I think it will have a few big hits.  My top 3 worldwide grossing films are:
1.  Iron Man 3
2.  The Fast and the Furious 6
3.  Monsters University
Runners up include Star Trek Into Darkness, The Hangover Part 3, Man of Steel, The Hobbit: The Desolation of Smaug, Thor: The Dark World, Despicable Me 2, and possibly (hopefully) Pacific Rim.