A possible new Mario game has been announced by the voice of Mario himself, Charles Martinet! Charles Martinet has been posting about a new Mario game on his twitter for the past few days.
"Mama Mia!!!! I'm going to Seattle this week to record a new Mario game! Woo Hooo!!!!! I can hardly wait!!!!1"
"Big day tomorrow! Seattle for a new Mario game! Yippee!!! And just as a joke, it's going to rain....in San Francisco tomorrow!"
"Awesome new Mario Game! And it's not NSMB Wii, and it's not Galaxy 2, but it's going to be crazy fun!"
So far, next to nothing is known about the new game. It's been confirmed that the new Mario game won't be NSMBWii or Galaxy 2 leading to speculation on what it actually is.