The North Carolina statutory deadline for candidates to file for the March 2020 primary is December 20, 2019.  But on November 20, a state court enjoined that deadline, but only for U.S. House candidates.  The court did not set a new deadlline.

The order affects five parties, all of which are nominating by primary in 2020:  Republican, Democratic, Libertarian, Constitution, and Green.  In 2020, the latter two parties are having their first primaries in history in this state.

The state court will hear arguments on December 2 on whether the new U.S. House districts are constitutional.  If the court invalidates the districts, so that new districts must be drawn up quickly, there will be further orders about the deadline and perhaps the primary date itself.  The case is Harper v Lewis, Wake Co. Superior Court, 19 CVS 012667.  Here is the order.  Thanks to Rick Hasen for the link.