Nintendo has made a habit—and millions upon millions of dollars—of tweaking its Nintendo DS handheld gaming system and re-releasing it. The upgrades typically goose consumer demand, and until recently, there was no reason to think the just-launched Nintendo DSi XL would be any different.

Nintendo DSi XL

But last week, Nintendo’s Japanese headquarters threw its American division for a loop, issuing a surprise announcement that the company was working on a 3D handheld gaming system that doesn’t require users to wear special glasses. The Nintendo 3DS, as it’s called, will go on sale sometime between April 1 and the end of March 2011 (Nintendo’s next fiscal year).