God Eater 2 was released on PSP and PS Vita in Japan on November 14, 2013, but there's still a big feature on the way: Online multiplayer. Bandai Namco will be bringing it to the game via update patch 1.40, and a blog post recently pegged the release window for the second half of May.
According to the post, the team has been working hard, even throughout the Golden Week holidays, on network adjustments and debugging. They apologized for not being able to provide a more accurate release date, but there could always be more issues as it approaches finalization.
The blog will be updated with an official release date once the patch is in its final stages.