This January, you'll be able to play Plants vs. Zombies on two screens without running two simultaneous games on your iPhone and computer. PopCap Games revealed plans today to publish the tower yard defense game on DS in January of next year, at a suggested $19.95 price point.

The DS version will have all the content of the original release, "as well as new and exclusive game content." The DS port of Peggle added entirely new, entirely weird levels under the existing levels, but there's no telling how extensive or insane the additions to Plants vs. Zombies will be.
Source- PopCap's Plants vs. Zombies