Probably the best part about the 3DS handheld console is that it displays 3D graphics without the need for any 3D-enabled glasses. The device itself hosts dual screens, with the 3D widescreen up top and a 2D display on the bottom. If 3D isn't your thing or it becomes distracting, there is a sliding mechanism to adjust it or turn it off. The final 3D element is a three-part 3D camera on the front to shoot 3D images.
Other features that make gameplay all the better are a a gyroscope, motion sensors, and a slide pad for 360-degree analog input.
Both the lists of first- and third-party developed game titles already read like a dream. From Nintendo, we can expect Mario Kart, Starfox 64, and Kid Icarus, which pretty much hasn't been seen since the old NES days. From other developers, we'll get Resident Evil, The Sims and (my personal favorite) Kingdom Hearts.
This is far from the complete list. There are more titles listed on the E3/Nintendo 3DS product page, but they're surely planning to launch more titles in the coming months.
The bad news is that there was no news about a price nor a release date for what looks to be a stellar personal gaming device.