Nintendo are developing a new handheld with the temporary title "Nintendo 3DS" hopefully released some time next year
In their press release Nintendo has stated that "games can be enjoyed with 3d effects without the need for any special glasses"
Hopefully it will look something like this
This is Rittai Kakushi e Attakoreda, a DSiWare game that makes brilliant use of the Nintendo DSi's built-in cameras to control an in-game camera that lets the player explore a 3D diorama to find hidden objects.
There is a lot of speculation on the net about the new features this handheld will have, but it's best to wait until E3, which is scheduled to be held from June 15th at Los Angeles in the US, when Nintendo will release more information