This was revealed a few years ago and we're finally hearing more about it in the form of a preview and release date for the second movement!
http://www.brillia-sst.jp/topic/2014/09/post-222.html
http://tezukaosamu.net/jp/news/n_1478.html
Looks like it will be premiered at the Hiroshima International Animation Festival on August 21st.
Tezuka's first and final movements of the film set to Tchaikovsky's Symphony No. 4 are of course available on the Astonishing Work of Tezuka Osamu DVD by Kimstim.