The chameleon isn't a QuartzExtreme demo, it's an NVidia OpenGL demo. (That is, it's all bout 3D content -- in and of itself, it doesn't demo QE because it doesn't integrate 2D and 3D content.) As to whether it'll be made available for people to play with, I don't know. (On a related note, I talked to someone from ATI a few months ago and he said he was thinking about making some of their graphics demos into Mac OS X screensavers. That'd be cool.)
The floating spinning objects used to demo QuartzExtreme at WWDC and other events are really simple: they're standard OpenGL examples (quite possibly based on the ones in /Developer/Examples/OpenGL) modified to draw in a transparent borderless window and set the GL "clear color" to RGBA 0,0,0,0.
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