The National Independent Soccer Association, a D3 league intended to participate in pro/rel with NASL eventually, is set to launch in 2018:
http://midfieldpress.com/2017/06/06...onal-soccer-league-expects-to-launch-in-2018/
http://midfieldpress.com/2017/06/06...onal-soccer-league-expects-to-launch-in-2018/
