This has the potential for making Leftist heads explode as much, if not more than the Citizens United case.
What's at stake is predominantly "Section 5" of the 1965 VRA which requires Federal "Preclearance" for the states to make certain changes to their voting laws, or district changes. This goes back to all the Jim Crow voter suppression that was going on in certain southern states back then. And the re-authorization of the Act is political plutonium, because who on either side of the aisle would want to go down as against "voters rights"?
If Section 5 and Preclearance is overturned as unconstitutional, the states will have a freer hand in enacting laws or election rules that help combat vote fraud, or eliminate gerrymandered racial districts.