Bottom line: "Dear San Antonio court, we realize that the legislature maps were problematic, but they still should have been your starting point."
I'm not sure what this really means, my guess is that now the San Antonio Court will wait for the DC Court to rule on pre-clearance in early February. I doubt a primary on April 3 is still possible, though April 10 or 17 might be possible depending on the pre-clearance ruling.
The complete unanimous SCOTUS ruling is here. And Clarence Thomas is still a world-class douchebag since he issued a concurring opinion stating that he would have instructed the San Antonio court to just use the original legislature drawn maps.