According to sources, the Game Boy Advance will have a higher sprite count than the Game Boy Color. Expect the first generation to be around the graphic quality of the first generation SNES games. With the new hardware, game design can finally get more versatile. To give developers an idea of what to expect with what's possible on the hardware, Nintendo is reportedly showing a one-level demonstration of Yoshi Story on the Game Boy Advance development station. And it sounds like game developers are happy with these new button additions.
More buttons means more options.
The Game Boy Color system doesn't exactly have horsepower dedicated to pushing out quality audio, that's for sure. Sources have told us that this will be different with the Game Boy Advance. From what we've been able to uncover, expect music and sound effects that equal or rival the Super NES's superb soundchip. That means multi- channel digital sound and vibrant MIDI music, as compared to the scratchy, generic FM capabilities of the Game Boy and Game Boy Color. Another capability that Nintendo will not elaborate on is the Game Boy Advance's cellular phone and Dolphin connectivity.