Ngmoco says the deal will help DeNA expand its social network Mobage to Western markets. Mobage has "tens of millions of users in Japan," according to ngmoco, and ngmoco's own plus+ online gaming network has 13.5 million registered users in the West.
Ngmoco recently announced that it will expand beyond iPhone, iPod touch and iPad games to support the Android platform with both old and new titles. As a result of the acquisition by DeNA, ngmoco will offer mobile game developers the "Open Mobage Smartphone SDK," a set of tools that will allow simultaneous support for Android and iOS devices in both Japan and the West, utilizing the social platforms the companies have established in both regions.
A developer beta program will reportedly begin in December. If you're interested, you can sign up now.