The Todd Rundgren score for the original surfaced a few years ago on youtube, with some classic themes in there. He made quite effective use of his own song "can we still be friends" which he redid as part of the musical score, updating it and melding perfectly with the rest of the score.
Empire of the Sun are a unique band with a unique sound, so it may be possible that they will bring something equally as good as Todd Rundgren did all those years back.
Let's hope they do something great. Dumb & Dumber's music was very distinct, so hopefully Empire of the Sun can do something as good.
Normally, fan requests for sequels are never met, but in this instance, it seems they felt the time was right. 1994 and now 2014, time sure does fly.