On December 19, the North Carolina Supreme Court upheld the 2011 redistricting plan for both U.S. House and state legislature. See this story. The voting rights advocates who brought the case say they will ask the U.S. Supreme Court to reverse the State Supreme Court. A similar case is before the U.S. Supreme Court now, concerning Alabama legislative districts. Both sets of plaintiffs argue that the districts pack too many African-American voters into certain districts, which prevents them from having an impact on most other districts. There were other issues in the North Carolina case as well, concerning splitting precincts.
The North Carolina case is Dickson v Rucho, 201PA12. Here is a link to the 51-page decision. The vote was 4-2, with one justice not voting.