Atari confirmed on the 9/4/12 the RollerCoaster Tycoon 3D for the 3DS will be released on 10/16/12 in North America and in Europe on 10/26/12.
The game is being developed by n-Space and designed to use many of the 3DS's unique capabilities. As an example players parks will be transferable over Street Pass.
The game features a gameplay mode new to the series called Coaster Story, which blends together various tutorials and challenges into a story based structure. Players will also unlock new content through this mode.