Nintendo's 3DS will hit the US on March 27, 2011 for $249, that's less than the speculated $299 price but still $70 more than the current most expensive Game Boy.
The 3DS comes packaged with a charging dock and a 2GB SD card. Cosmos Black and Aqua Blue are going to be available in North America at launch, which are the same colors available at launch in Japan.
The 3DS is the next-gen Nintendo DSi. The form factor is the same and it still uses a touchscreen for the bottom screen with a unique glasses-free 3D screen above it. There's an analog nub above the traditional 4-way pad and the top screen is 10% larger.
3DS is backwards compatible with DS and DSI games but they'll just work in boring ol'2D. There's even a Blackberry-ish notification light on the top corner to indicate if data is incoming or outgoing.