Here is a look at the Japanese launch titles for the Nintendo 3DS.
Nintendogs + Cats
Winning Eleven Soccer 3D Soccer
Combat of Giant Dinosaurs 3D
Super Street Fighter IV 3D Edition
Samurai Warrior Chronicles
Puzzle Bobble 3D
Ridge Racer 3D
Professor Layton and the Miracle Mask
I believe there is a good chance that some of these games might be launches for other countries. Nintendogs + Cats seems like a possible launch title for other countries due to its simplicity. Super Street Fighter IV 3D Edition is also another possible launch title for other countries. Samurai Warrior Chronicles will most likely be a launch title for the United States. Puzzle Bobble 3D also known as Bust-A-Move does not seem like it will be a launch title. Puzzle Bobble 3D seems more of the type of game to be used in a dry season. Ridge Racer 3D might be a launch title if the Nintendo of the country are into racing games. Professor Layton and the Miracle Mask will not be a launch title for the United States. The fourth game in the series is not yet localized for the United States and the Miracle Mask is the fifth game.These are just my own speculations to the launch titles.
Curse the small battery life and region locking!