Plenty of traditional table and board games have made it to the DS, so there should be room for just one more little title! Rummikub is vaguely scheduled for a Q4 2008 release date, but we're expecting screens and updated information to surface very shortly.
In the meantime, you can probably pick up an original set and give it a try with friends in RL. This experience will feature a durable cardboard box to prevent scattering of pieces, a table surface made of genuine wood or water-resistant plastic, and real-time wireless conversation with up to three friends. You don't want to provide the snacks for more than that amount of people.
[Via press release]