It now has a motion and gyro sensor which enhances the reaction to the motion and tilts of 3DS, 3D screens ( that do NOT require special glasses or anything ) , a 3D depth slider that adjusts the 3D effect and settings, two screens that allow double the play and graphics, analog control and an adjustable stylus that gives better control to the gamer, and lastly, but surely not least a 3d camera that allows 3D photos ( much like the 3D screen. These new features are believed to make a gaming expirence on the Nintendo 3ds, an incredible and advanced one.
The price for one of these advanced console is about $250. These pieces of new technology obviosly do not come cheap !
( Images retrieved from http://www.nintendo.com/3ds )