The National Symphony in Washington will present the Kaddish June 2-4, link here.
The Washington Post has a critical prospective article by Stephen Brookes, May 27, "Samuel Pisar's 'Kaddish': A warning to a world out of control", link here. The new performance will have a different narration written and read by Holocaust survivor Samuel Pisar. Leonard Bernstein's own memorial website has an article on it here.
You can watch on YouTube a segmented performance of the Kaddish Symphony conducted by John Axelrod, CLC Productions with the Orchestra of Paris, starting here. Pisar's text is harrowing. "My life is not my own." Play it loud.
Update: October 23, 2017
The New York Times has a detailed article discussing the three numbered symphonies, by Anthojy Tommasini, link here. YouTube videos are embedded. The Symphony 2 is indeed in C# Minor and the ending does recall Mahler's Third (also Hevergal Brian's Third, in the same key). The Symphony 3 ends if G Major according to my Casio. I couldn't find any performances scheduled though by the NYPhil during the celebration period.