I want a ww/ph sequel. The ds already did shaded games so 3rd would be a good platform for another ww lookalike. In the beginning, you will have to sail around and solve puzzles on various islands and as you complete dungeons, water will drain as evil is depleted from the land. Each time water drains, there will be new areas and puzzles on the land, as well as people migrating to new areas creating new towns. The expansion of towns will centralize around the trees planted by dekus in ww. Side quests in towns may involve doing something to promote the growth and life of the tree in each new town.
Some dungeons will need to be revisited to collect a new item for a different area. For instance, link will acquire iron boots and have an underwater dungeon where he can only use few select items (like the clawshot in oot) but then have to go back once the water is lower than the dungeon area so he can use his entire arsenal of items to progress. The transportation in the beginning will be a sail boat and towards the end of the game when the entire land of hyrule is revealed, link will somehow acquire epona.
An alternate to this would be an element like time travel that takes link to the future when the water is gone and back to the past when he has to sail around and can reach the top of mountains. The world of wind waker would look great in 3d.
Sorry for any spelling errors, I'm on an iPad and it autocorrects way too much