Nintendo has been selling its various forms of the DS portable console for a long time now and doing very well with the things. The DS has massively outsold other portable consoles like the Sony PSP for a long time.
Nintendo is set to embrace the 3D future with the announcement that it is working on a new portable console called the 3DS. I like that name, it's catchy. Nintendo is mum on hard details for the console.
The most important bits of info are that the 3DS is coming, it will need no 3D glasses, and we will learn more in June at E3. A 3D portable with no glasses sounds pretty darn sweet.