The unnamed 3DS Pok�mon game could easily be the third version of Black and White. Heck, the Wii game could be, too.
As for the keyboard, it couldn't be used in any current Wii game with USB keyboard support, but it could be used if a game is specifically designed for it. The Wii can recognize up to seven devices at one time, with four generally being Wii Remotes, so the other three can be used for accessories, like the Balance Board.