If you don't like to wait... there are some more details in the discography part of the Idil Biret website at
www.idilbiret.org I could also not listen to this brandnew recording but fortunately I could attend one of her concerts some weeks ago where she enchanted the audience with excerpts of the ballet. The only known complete recording before has been made by the composer himself during the 1920th (piano rolls). Rgds,