WhatCulture.net have very sneakily spotted that Sony, through an agent, have registered the following domain names, jamesbond-skyfall, jamesbondskyfall, skyfall-film, skyfall-themovie, skyfallfilm, akyfallmovie, skyfallthefilm, skyfallthemovie, sky-fallmovie and more.
So it may well be that the next James Bond movie, the twenty-third in the usual counting, will by called Skyfall.
However there is no reference to a "Skyfall" in the books. There is a Transformer called Skyfall though. I don;t suppose there's any chance of a crossover?