User blog comment:Paul.rea/Teen Wolf News 051116/@comment-28006170-20160514023712/@comment-4091815-20160514032645

http://deadline.com/2016/05/dylan-obrien-american-assassin-maze-runner-vince-flynn-cbs-films-lionsgate-1201752315/

This says production is currently slated for the Fall which means anytime from September through November. It's the only original reporting from a trusted source I've seen on this.