I'll bite.
Nintendo has their own court, and their own ball, imho. I think their court is just going to get bigger and videogame selection in 8th gen will be more about mindset on videogames than brand loyalty and number crunching.
I think PS4 will either take a drastic shift towards the Japanese side or towards the American/International side. If American developers never figure out how to develop efficiently for PS3, then the console will become Final Fantasy and Metal Gear fans only.
Microsoft is going to take the path of least resistance towards money. No risks, no nothing. It'll include the most popular aspects of the Wii and probably some tilt control in the "720." I wouldn't count on a wiimote, but chances are all controlers will have some point at screen capability.
If PS4 tilts to Japan, I wouldn't count out a new entrant to the video game scene either. I couldn't guess who, but the time might be ripe for a system even *more* specialized than the Wii...