Okay, these are the Leaked Stages it seems...
-Battlefield, Final Destination, 3D Land, Golden Plains, Paper Mario, Rainbow Road
- Mushroomy Kingdom (B), Jungle Japes (M), Gerudo Valley, Spirit Tracks, Yoshi's Island (B), Brinstar (M)
- N's Castle, Prism Tower, Corneria (M), F-Zero SNES, Arena Ferox, Tortimer Island, GB Kirby Dream Land, Reset Bomb Forest, WarioWare (B), Distant Planet (B), Boxing Ring, Magicant?,
- Living Room, Tomadachi Life, Pictochat (B), Find Mii, Balloon Fight, Flat Zone 2 (B)
- Gaur Plains?, Wily Castle, Pac-Maze, Green Hill (B), Random
Unsure about Magicant and Gaur Plains, but there's no Mother or Xenoblade stage and those fit.
Thoughts:
Mario gets SEVEN fucking stages. This sort of pushes me towards fake, as all those already exist and thus is an easy way to fill a stage select screen.
Zelda and Pokemon get two, both are new.
DK, Yoshi, Samus, Fox, Wario, Pikmin, Sonic, and GW are CHEATED out of a new stage.
No real home stage for WFT or Duck Hunt Dog or ROB.
Nice selection of "casual" portable games like Nintendogs, Pictochat, and Find Mii. I sort of think WFT could call any of these her home.