The Supreme Court issued its ruling in Gill v. Whitford on Monday, June 18, the partisan gerrymandering case, and they essentially punted.
The ruling states the plaintiffs failed to show standing and sent the case back to the lower court for further proceedings, “in the course of which those plaintiffs may attempt to demonstrate standing in accord with the analysis in this opinion.” The opinion was by Chief Justice Roberts. Kennedy, Ginsburg, Breyer, Alito, Sotomayor, and Kagan join all; Kagan concurs (joined by Ginsburg, Breyer, Sotomayor); Thomas concurs in part and in the judgment, joined by Gorsuch.
So at the end of the day, the maps in Wisconsin will stand for the 2018 election, still uncertainty over any future ruling, and should there be one-party control when the maps are drawn again after the 2020 census there will be another lawsuit.
The 2011 redistricting was the first time in decades that the legislature redrew the maps themselves. In previous cases, there was split government so the maps were inevitably drawn by the courts due to both sides not reaching an agreement through the legislative process.
Democrats complain that the maps unfairly proportion the legislature into a Republican majority. They point to statewide votes of around 50% for the GOP yielding 60+ seats in the 99-seat Assembly. Republicans counter that they have many members that were elected in districts where those same voters also voted for Democrats at the top of the ballot, so they just recruit better candidates and run better campaigns.