The title for the final Evangelion film was announced back in 2012 as Evangelion Shin Gekijōban :||, or Evangelion: 3.0+1.0.
The first three films in the tetralogy, Evangelion: 1.0 You Are [Not] Alone, Evangelion: 2.0 You Can [Not] Advance, and Evangelion: 3.0 You Can (Not) Redo, debuted in 2007, 2009, and 2012 respectively.
Animation director Takeshi Honda (Neon Genesis Evangelion, Rebuild of Evangelion films) stated in an interview with the UK Anime Network in October that the fourth Rebuild of Evangelion film is in progress.
“We’re actually working on the new Evangelion film right now,” Honda commented.