Didn't see anything about any release, but couple of critics about the movie (sorry guys, in French), with some comments about the music as well :
http://www.lepoint.fr/cinema/quartier-lointain-nostalgie-envoutante-22-11-2010-1265447_35.phpJust quoting the statement about the music from the above
"Quartier lointain bénéficie aussi d'une formidable bande originale signée Air, qui d'ordinaire compose pour Sofia Coppola. Une musique atmosphérique, planante, qui donne au film cet air d'inquiétante étrangeté chère à Freud."
And translating in English :
"Quartier latin" gets benefit from an amazing original soundtrack signed by Air, who usually does Sofia Coppala movies music. An atmospheric and dreamy music, which provides the movie an ambient of worrying strangeness, as Freud would like.