Nintendo announced several DS games today, and Japanese magazine Famitsu has screenshots. Among the games are Mario Basketball 3 on 3, a Tingle RPG, another brain-training game, and many more interesting concepts.
Update: Even more screens are posted in the Nintendo Forum. A complete list of the newly announced DS games is available at Planet GameCube. [Thanks Rollin]
Here are two of my favortite screens from the batch:
