A fully 3D Pokemon with MMO for Wii U releasing in summer 2015, in combination with the option to sell the gamepad separately.
GAF would be shut down for a month- hell, something like that might even revive the WiiU itself. Especially with Mario Kart, and already SSB on their way. Nintendo could bundle the thing and finally start moving some real product. A man can dream...
Other things that'll shut down GAF:
Zelda HD (this is almost certain to happen)
Metroid Prime style game for Wii U (may happen)
X (probably going to happen)
Some crazy character in Smash like Ryu or Cloud (not likely, but we'll see).