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.


Here's the lowdown on the important stuff:

Size :134mm × 74mm × 21mm
235g

Retractable stylus up 10cm

Battery charging time: 3.5 hours
Playtime @ low brightness: 8 hours

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

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The Japan launch date is 26th February so the other dates will probably be the first week of march