At a management direction meeting held today, Nintendo unveiled some new information about the DS and Wii.

Some features involving the DS-Wii connectivity include the ability to use the DS as a touch-screen control for Wii games and the Wii acting as a DS download station for game demos. Iwata also said that DS games could be “expanded” via Wii.

source: PlanetGameCube

    

If the Play-Yan ever comes out then the Wii could be a storage bank
possibly for the DS.