The suit is specific to Apple's new Mac OS X 10.6 Snow Leopard operating system - which is why Apple wanted it thrown out, saying that the new suit was "essentially identical" to the existing legal imbroglio between Apple and Psystar, which centers on the previous operating system, Mac OS X 10.5, aka Leopard.
Uhh, that seems pretty straightforward...
Either the judge doesn't understand that there's really nothing different about Snow Leopard or there's some legal nuance I'm missing.