The case is scheduled to be heard by SCOTUS on March 2nd. A total of 16 briefs have been filed by various groups: 14 friendly to the AZ Independent Redistricting Commission and 2 favoring AZ legislators. Each of the briefs is summarized in the preview from the Brennan Center for Justice (NYU School of Law). Here is the issue:
This term, the Supreme Court takes up the issue of what the Constitution’s Elections Clause means when it says that the "Times, Places, and Manner of holding Elections . . . shall be prescribed in each State by the Legislature thereof." (Article I, sec. 4)
Granted, I am no lawyer, but I do not see why SCOTUS is even involved in this. "Times, Places, and Manner" don't seem to address in any way a citizens commission impaneled to draw maps.
Each of the summaries in the preview are short and readable.