Reggie Fils-Aime today defined the 3DS' launch window as between March 27 and June 7, when E3 kicks off, and said that more than 30 games will be available to Nintendo 3DS owners over those two months or so.
So far Nintendo is only naming 23 of them in the U.S. Here they are:
nintendogs + cats
Shin Megami Tensei: Devil Survivor Overclocked
Super Street Fighter IV 3D Edition
Resident Evil: The Mercenaries 3D
Madden NFL Football
The Sims 3
Pro Evolution Soccer 2011 3D
LEGO Star Wars III: The Clone Wars
Ridge Racer 3D
Dual Pen Sports
Super Monkey Ball 3D
Thor: God of Thunder
Samurai Warriors Chronicles
Dead or Alive Dimensions
Tom Clancy's Ghost Recon Shadow Wars
Combat of Giants: Dinosaurs 3D
Tom Clancy's Splinter Cell 3D
Rabbids Travel in Time
Nintendo says that The Legend of Zelda: Ocarina of Time 3D, Star Fox 64 3D, Kid Icarus: Uprising and new installments in the Mario Kart, Animal Crossing and Paper Mario series, are also all in the works. I take that to mean that they won't be hitting that "launch window."
You can also check out the Japan launch titles here.
Stay tuned to Kotaku's 3DS page for a day full of updates, interviews and videos.