Kotaku sources, there's been "chatter for several days" about an impending closure and the possible cancellation of a current project. Sony has not commented on the situation.
Those with short memories may recall Zipper Interactive for it PS Vita shooter, Unit 13. But the company's roots go much deeper -- Zipper Interactive was founded in 1995 and spent the remainder of the '90s making Windows games. In 2002, Zipper created a little PS2 game for Sony called SOCOM: US Navy Seals and, after spending the next few years pumping out sequels, it was acquired by the publisher in 2006. The developer completed work on the large-scale multiplayer shooter, MAG, in 2010.