On August 19, 2015, Ars Technica reported that Gearbox Software finally acquired the Duke Nukem franchise from 3D Realms after a long legal battle that started in February 2014.
Gearbox thought it had purchased the rights to the Duke Nukem franchise in 2010 when it took on work for Forever. However, 3D Realms then began advertising a new game called Duke Nukem: Mass Destruction in 2014.
While the settlement terms were not announced, the parties reportedly voluntarily ended the suit, giving ownership to Gearbox.
Ars Technica has more information on this story here.
Sorry for the delay in reporting this one.