Correct me if I'm wrong, but I have sources telling me that Super Pokemon Scramble was confirmed by Nintendo a couple of hours ago. I really need a 3DS... :(
EDIT: And I now have proof.
For none Japanese speakers, it basically confirms that the rumours are true, announces the expected release date (28th of July), and explains as to what the game will be. It is basically as suspected, a Pokemon Rumble sequel/remake, where "the player controls little Pokemon toys in this new Pokemon action game". My Japanese is still pretty bad, but that's really all it says. Plus to keep checking the official Pokemon site for more information.