I think it would be smart for Nintendo to launch in the US in early September and stagger the Japan and Europe release thirty and sixty days out. It should hopefully ease the supply chain. Nintendo had a problem with the supply chain with the worldwide release of the Wii.
The other reason it would be smart is it will allow Nintendo to launch with 8 to 10 games and stagger releases thereafter September thru December. It would be good will with the third party developers. Releasing 15 to 19 games at launch would be awesome. But you will run into one big problem. The smaller third party games will get eaten alive. For example if Nintendo launches with 2 or 3 Nintendo developed games like Pikmin, Retro's games, and Super Mario Mii, Assassins Creed 3, Darksiders 2, COD Black Ops 2 (or whatever it's called), Ghost Recon, and smaller.
You know Ghost Recon and Darksiders 2 will get eaten alive by COD, Nintendo, and Assassins Creed 3 if released at the same time. This allows the smaller releases, a better chance to sell their products.
Release in September with 8 to 10 games. Maybe it's Pikmin, Wii Sports 2, Darksiders 2, Ghost Recon, EA Sports game (Madden or Fifa), Batman Arkham City, and a kids games. Then starting every week or two after they can release games with the natural release dates. Assassins Creed 3 at the end of October for example. This would make the most sense to me and maximize game sales.
This allows early adopters to purchase the systems early and will free up system availability by the holiday season in November and December.