In TPs ending, Ganondorf is not dead yet when he gets impaled by the Master Sword. It is shown that Ganondorf's trying to survive using the Triforce of Power; but then weget a clip of Zant breaking his neck, the Triforce of Power dissapearing from Ganondorf's hand, and Ganondorf dieing.
What I believe, is that Zant and Ganondorf shared a connection, much like Zelda and Midna shared a connection for half of the game. As long as one of them lives, the other will survive; Zelda could not die as long as Midna lived , and Zant could not die as long as Ganondorf lived.
I think Zant, sharing a connection with Ganondorf, waited until he was weakened enough; then stole the Triforce of Power.
So, shall the next Zelda be a direct sequel to
TP, then I think Zant possessing the Triforce of Power would be a possible antagonist. Maybe even make it so Ganondorf survived throught Zant, and it's two conciousness sharing the same body.