In August, FX CEO John Landgraf announced that Noah Hawley had already completed four scripts for season 3 of Legion. 
According to Production Weekly, season 3 will begin filming on November 27 in Los Angeles. Its working title was reported to be "CH3" and "Clubhouse". Filming is expected to last until March 26. 
It has been confirmed that season 3 will be the last season.
- ↑ 1.0 1.1 ‘Legion’ Returning in 2019, Though Don’t Expect Professor X to Appear
- ↑ 'Legion' Renewed for Season 3 at FX
- ↑ Noah Hawley is Already Working on Legion Season 3
- ↑ FX's Legion Season 3 Filming In November, Working Title Is 'CH3', Details