I'd like to see a tighter Zelda/Link fusion, where Zelda's time powers are weaved more into Links combat.
A hard game where Link dies and dies and dies, but Zelda keeps rewinding time and bringing him back to life, where he learns from his mistakes (similar to PoP:SoT).
As the game progresses and the combat gets harder, Link gains the ability to slow down time in order to better plan his attacks as they happen. He's not moving super fast like the Flash when time is slowed, for he is slowed down too, but he can simply react better; dodge a sword by anticipation, plan a jump off an enemy's head with better timing, turn a dodge under a weapon into an attack in the same stride, all the while preserving his momentum.
By the end of the game, he can literally stop time, and he does so endlessly at the game credits, as its the only way to free Zelda from her time prison. Zelda and Link effectively switch places, and the next game is Zelda trying to free Link