I've been playing around with some musical ideas as well as possible lyric themes.
What are the themes that the film will revolve around? I don't need to know the plot details (better if I don't I think, we don't want a song like The Man With The Golden Gun that spells out the plot) but just the overall themes, such as loss, revenge, finding one's place, etc.
Also, what happens in the pre-title sequence leading into the song? For example, in Skyfall, Bond falls from the bridge into the water which leads into the song. You Only Live Twice leads from Bond's death into the song. Die Another Day (while the song is pretty awful) interestingly integrates the montage of Bond's torture in a POW camp into the graphics. And so on.
This is key in leading us into the tone of the song sequence, and on my part, decisions on whether the song is in major or minor, tempo, instrumentation, and the point of view of the singer (male or female, voiced by a character or third person omnicient, etc.)