Basically this is what happens when you shove a Nexus 7 into a Wii U GamePad. Well, not really a Nexus 7, just a standard dual core 7" Android tablet.
It's by a Chinese company called JXD who makes these kinds of devices regularly. I already own another one of their products and I'm pleasantly surprised by how good the build quality is. I've been waiting for this for months now (partially because it's closer to what I wanted the real Wii U to be like), and in a few weeks it will finally be out. You can find more details, here: http://www.jxd.hk/products.asp?id=62...classid=009006