What else could Phish do in addition to playing a 3-day festival (Festival 8 - see our review and photos) where they played 8 sets -- including an acoustic set and a set that covered the Rolling Stones' Exile on Main St. in its entirety -- over Halloween weekend? Of course! Film it and turn it into a 3D movie.
The trailer alone (and without 3D) looks amazing.

PHISH 3D - IN THEATERS APRIL 30TH from Phish on Vimeo.