Activision alleges EA illegally attempted to lure away Call of Duty creators and Infinity Ward founders Jason West and Vince Zampella. Activision is also suing the two developers.
EA was added to the suit roughly a year ago, but had recently argued that it did nothing illegal in talking with the pair. The judge disagreed, though, saying there was sufficient evidence to move forward with the case against EA.
West and Zampella, after being dismissed by Activision, formed their own studio and have since struck a publishing deal with EA.