Nintendo of America announced today that the upcoming Mario & Luigi: Partners in Time (slated for a November 28 release) will be the second title released that is compatible with the DS Rumble Pak.
The DS Rumble Pak will be bundled with Metroid Prime Pinball, slated for an October 24 release. Nintendo has not yet announced plans to sell the DS Rumble Pak separately, nor have future Rumble Pak-compatible games yet been announced.