A trailer of Miiverse, global social network around the universe on the Wii U, 3DS, and more devices. Together Wii U.
The main menu is going to be like PS Home, an always on persistent MMO where you can interact with various Miis. It will be called the Miiverse, and you can access it anytime. Nintendo confirmed it can be accessed from multiple devices, including smartphones, and they confirmed that Nintendo Network is persistent and unified across multiple Nintendo devices, including the 3DS, Wii U, and any future Nintendo hardware.
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