On the Japanese site the 3DS specs have been released.
Before I say what they are, I'll tell you that in the box you'll get 6 AR cards that can be used with the camera for special content, and a 2GB SD card.
The system will have motion and gyro sensors which work in 3D
It also has some kind of way to launch other programs like the browser (yes it has a browser ) without interrupting your game, so you can read that walkthrough without even having to save
The Japan launch date is 26th February so the other dates will probably be the first week of march