At Nintendo's financial results meeting today, Nintendo President Satoru Iwata announced the company is planning to bring Nintendo DS games to the Wii U Virtual Console service, allowing certain titles to be playable on the Wii U Gamepad.
Iwata did not reveal which DS titles would be playable, although he highlighted how good the popular DS title Brain Age might look on the Gamepad's screen in a presentation slide.
IGN: http://www.ign.com/articles/2014/01/30/nindendo-ds-games-heading-to-wii-u-virtual-console