I don't know, i know the game will look beautiful in both night and day and if there are night quests like Poe hunting then it'd be nice for it to last a little longer than the day like it did in TP.
I think the cycles should be rather long though. It didn't bug me so much back in the day but whenever i play OoT now the day seems to turn to night and vice-versa so quickly, but i know its a scale thing, a faster passage of time for a smaller world to make it feel like its bigger than it is. Thus by that logic Zelda U's night/day cycles should be pretty darn long, weren't Skyrim's an hour?
Either way though we definitely need a way to change night to day when we want. It was a bit of a bugger in TP to wait until nightfall sometimes and if Zelda U's cycle is gonna be longer then its going to be even more of a chore so we need an item or something to do that.