Just confirmed:

She & Him (Never played outside of the US/Canada before)
Liars
Trash Kit

So full lineup so far is:

IGGY & THE STOOGES / SPIRITUALIZED performing Ladies and Gentlemen We Are Floating in Space / SHE & HIM / THE XX / COCO ROSIE / BUILT TO SPILL / HOPE SANDOVAL & THE WARM INVENTIONS / JAMES CHANCE AND LES CONTORTIONS / PANDA BEAR / DEERHUNTER / DANIEL JOHNSTON / LIARS / THE RESIDENTS / BOREDOMS performing Boadrum / THE RAINCOATS / BROADCAST / THEE OH SEES / JUANA MOLINA / LIGHTNING DUST / KONONO N°1 / TOUMANI DIABATE / DANIELSON / JAMES BLACKSHAW / AMADOU AND MARIAM / PONYTAIL / SHONEN KNIFE / RUINS (SOLO) / VIV ALBERTINE'S LIMERENCE / ANNI ROSSI / COLD CAVE / THE TIGER LILLIES / THE FRESH AND ONLYS / HELLO SAFERIDE / TRASH KIT

Tickets and info at: http://www.atpfestival.com/events/mattgroening.php