According to Toonami's tumblr, Evangelion: 2.22 You Can (Not) Advance
will air on August 31st. Apart from this, there's also a "special little goodie" that viewers will find out about on 31st.
Evangelion 2.22 is the second of four films in Hideaki Anno
's re-make of the famous Neon Genesis Evangelion
anime series. It originally premiered in theaters in Japan on July 27, 2009 and internationally at the Hawaii International Film Festival on October 24, 2009. The third film, Evangelion: 3.0 You Can (Not) Redo
, is currently being screened at the Jpop Summit Festival 2013 in San Francisco.
Source: Toonami Tumblr Profile
Story by Dunois