Bernie Grofman at The Monkey Cage (and to be clear, the Supreme Court has not yet agreed to hear any case raising these issues):
If, in 2017, the court does not specify a manageable standard for identifying unconstitutional partisan gerrymandering, “partisanship gone wild” will continue indefinitely, leaving us with a never-ending political nightmare: congressional delegations whose partisan balance is frozen into place regardless of changes in the preferences of the voters.
Stopping egregious gerrymandering is not a partisan issue; it benefits Republicans right now, but in the past it has advantaged Democrats. Regardless of which political party gains, the loser is U.S. democracy.