So I have updates:
Spielberg is listed on the rosters as "host", and as such they are only doing The Throne Room instead of the entire suite due to dialogue/talking. The pieces to be played to film are:
Superman March
Dear Basketball
Raiders Cave Sequence
Jurassic Park
Finale from E.T.
Williams will unfortunately only be conducting the encores. Two are listed above (Schindler and Raiders March) and the third will be the obvious one.