The ballad that Madonna has recorded for the upcoming film W.E. is called 'Masterpiece' and is produced by William Orbit. The song will appear on the upcoming soundtrack for the film.

From Madonnarama -
"The song seems to be about what it feels to love and be loved like a piece of art and how fragile this love can be.
From what we hear Madonna’s voice is absolutely stunning in it, and the track is very orchestral."

Source: Madonnarama.com