3DS has been in development for three years

“Three years ago when we started working on the 3DS screen, I knew I wanted to work on version of Ocarina of Time. I felt that if you were running around in those fields in 3D, you’d really feel like you were there in Hyrole.” – Shigeru Miyamoto

Well, that’s no surprise, really! Even though the DS had just been released a few years years prior, Nintendo was already working on their next handheld. That just goes to show they’re not lying when they say that they’re always working on new hardware!

Source