Just below 30m. Sequel will cut into it's legs, but not that much.
Bonus: Breath of the Wild is the most successful games in the series by a mile. Arguably the greatest game ever. Even Nintendo aren't crazy enough to mess with that formula too much. From the trailer I'm guessing there might be more focus on narrative, so maybe the world and progression will be less free and open. But overall I'm still expecting more of the same with improvements.