Kyle Hebert has confirmed Christopher Sabat (the voice of Vegeta, Piccolo, and more in DBZ) will not be voicing Shenron in the live action movie, despite being listed on IMDB and other places.
I ran into good ol’ Chris Sabat (DBZ director, voice of Vegeta, Yamcha, Piccolo, Mr. Pop, Shenron, etc) while I was recording at Funimation today and asked him since his name is listed on the movie’s credits on IMDB and numerous message boards have been buzzing about this for months. The answer, I was told, is no.