Sean Schemmel the voice actor for Goku has gone on record to say that he has not heard anything about Funimation dubbing the 18th film in the Dragon Ball Z universe. He said that this doesn’t mean they wont do it, but to not think of it until it gets official announced by Funimation officially. I really hope that it does get a dub because i found the English voice actors are better for me. But I will watch it when i can even if it is in Japanese. I believe Dragon ball Z is that kind of anime that is better in English then Japanese, but this is my opinion, yours might be different on that subject.
The Dragon Ball Universe 