With Adele singing "Skyfall", she has set the bar of Bond themes very high. Even if Skyfall wasn't hadn't been as successful as it was, the next singer would have big shoes to fill for Bond 24.
Adele has been suggested by Daniel Craig to return for the next film.
And for some reason, new Zealand's Gin Wigmore has come to my mind. I think her voice could be a vital contribution to an excellent Bond theme.
Who do you think should sing the title song of Bond 24?