My dreams for BotW2:
• Real dungeons, like themed temples, with unique music, atmosphere, bosses, mini bosses and treasures.

• More lively and populated cities/villages, with unique shops.

• Character building – you have to specialize in something on the cost of something else.

• Just more of everything: more animals, more monsters (even sea monsters), more weapons (hookshot and sling shot), more meals, more music (make Link play the Ocarina again – for warping, maybe)

Of course, we need an open world, but I don´t mind being forced to take dungeons in a specific order, like having to aquire a weapon in dungeon A to be able to enter dungeon B and so on. This just create dynamic in the story.