The beginning comes from the last few notes of the flute solo at the end of the piece. It is played on the vibraphone. The flute enters at about 1:08 (3rd system in this picture). I'm not sure yet how the piece will begin when it is a flute solo, but probably a shortened arrangement of this vibraphone material (probably will take advantage of the 9th multiphonic--with flutter tonguing on the long notes).
As with the previous post, this is only a sketch.