I'd like to see a new game on any branch of the timeline, but utilizing the grittier, more life-like graphics of
TP and
OOT (as opposed to the cartooned WW). It would be amazing to have a game set in New Hyrule after Spirit Tracks on the Adult Timeline, featuring locomotives and other newer technological innovations with an air of realism.
On the Defeated Timeline, a game set during the Gold Era would be cool, though I suppose it would be difficult to come up with a plot seeing as that era supposedly didn't have any villains to shake things up.
I'd also like to see a game set during the Unification War that brought infant Link and his mother to Kokiri Forest. Perhaps we could learn of a little-known reincarnation of Link, "The Forgotten Hero," who plays a pivotal yet unseen role in the midst of the civil strife. Meanwhile, such a game would be a great chance to bring back beloved races like the Kokiri, Gerudo, and Sheikah in full post-polygon graphical glory. We could see Kakariko as it once stood as a village of Sheikah (bringing more Sheikah to a game than the various Impas, Sheik, and Impaz).