Nintendo 3DS, is the new DS which will have 3D-effect for the games.
As of, the graphics will likely be PS2/Wii no more than this.
It is said to cost 300$.
The 3D effect is supposed to be taken as a bonus not primarily for the games. Because gameplay matters.
3DS has PS2/Wii graphics and games seem to be pretty awesome, especially the new Dead or Alive!