Not sure if this has been brought up yet, did do a check on google and it didnt come up.
Basically the idea goes like this:
start app
init networking
connect phone to wii (wifi, maybe possible by tethering directly to device to reduce lag???)
send sprites to be displayed on second screen to phone via connection
send an xml file which states the properties and behaviours of sprites (animation, physics, user interactions)
phone can send back data of interactions (like button presses, text etc.)
essentially, with a tablet like the new nexus 7 and a classic controller pro we could essentially create an underpowered WiiU and because the android device would have a built in processor it shouldnt affect the wiis performance, in fact we could have a 3D view on the device and 2D on the tv.
This idea will take quite a while to build, we need to an app for the phone and the wii, we also need to take into account latency by using ping to delay the rendering onscreen. The android app will be harder to code since it will essentially be a game engine that is configured on the fly.
What do you guys think of this, it would be awesome to have this running before the WiiU is out its just a matter of whether or not its feasible?