This game will be literally so huge in content it will be crazy. The possibilities from the Botw mecanics and engine are INSANE. Now put 6 more years into a game and like adjustments from what people didn't like in the first one and you have something incredible. I hope they put more overworld boss and more secrets to discover than just shrines. That's the main takeaway from the first one that i would like to change. But like wow, i'm really not ready for the sequel. It will be literally insane.
Since the "expanded world" goes beyond the ground and the sky, maybe we'll be able to explore the underground. "New encounters" sounds exciting because the enemy variety in the first game was not exactly the best. I hope the game has more areas like the Hyrule Castle.
I hope it brings back more classic Zelda monsters and bosses, because I got sick of fighting different varieties of Ganon after a while.
At least the delay means it might be released around my next birthday, so I don't mind it too much. ^^
They def will i think, seeing how well the Lynels integration was in the 3D games i'm sure they will bring more.