AppleInsider has found a hidden .tiff file within GarageBand 2 labeled "asteroid.tiff". The file appears incomplete and is unable to be opened, but can be clearly seen in the package contents.
Additionally, MacRumors readers have found within iLife '05 Install DVD/Individual Packages/Packages /GarageBandApp20.pkg/Contents/ Archive.pax.gz - Asteroid Max Volume, Asteroid Min Volume, Asteroid Slider, Select Asteroid Input and many, many others.
Asteroid is expected to be an audio "breakout box" used to connect multiple audio instruments into one midi interface. Initial rumors began in November 2004, and leaks eventually led to Apple's legal charges against multiple online rumor sites for disseminating the information.