Brent, the SCOTUS (Supreme Court) is not a circuit. They take cases from all over the US and its territories.
This is within the 9th Circuit Court of Appeals. The case will be dismissed at the District Court level and the 9th will most likely make some wobbling ruling that holds for CA.
The CA AWB has been ripe for a while. It is convoluted and requires an actual roadmap to follow it and not be in unlawful possession of a prohibited firearm. I'll see if I can get the "map" from CalGuns.