Cave (known for its arcade shooters), Gree (known for its mobile phone games) and Electronic Arts (known for being Electronic Arts) are all working together on a new social game for Japan's Gree networked gaming platform.
Let me Google Translate this page for you:
Cave and Electronic Arts (EA), the green "GREE" announced a partnership with EA platform to develop a new Mobairusosharugemu held with the content.
Specific details have not been disclosed, a number of powerful and EA owns the IP, [that] take a combination of Shiro cave in to social success is starting with a very interesting .
Makes much more sense now!