Reports are coming in that FUNimation’s release of the franchise’s 10th anniversary movie (“The Path to Power”) does indeed use the original Japanese score on the English dub track.
Despite changing its theme music, FUNimation’s release of the second Dragon Ball movie (“Sleeping Princess in Devil’s Castle”) also used the original Japanese score, as did their release of the third movie (“Mystical Adventure”). When the company picked up again with producing the first TV series, it also contained the original Japanese score.
This is all in opposition to their production of the Dragon Ball Z TV series and movies, all of which have had replaced musical scores (with the exception of their work with Pioneer on the first three Dragon Ball Z movies back in 1997 and 1998), as well as their upcoming work on Dragon Ball GT.
Interestingly, the music in the 10th anniversary movie, composed by Akihito Tokunaga, is actually also used in the Dragon Ball GT TV series.