This is what I liked about Skyward Sword - each overworld area before the dungeons had several missions, puzzles and challenges that needed to be solved before even entering the dungeon. If they are taking this approach and running with it I'll be very happy with only 4-6 dungeons.
it's funny because for how much of a radical shift this feels like for the Zelda series it seems to also take so many different things from previous games and expand upon them
the overworld puzzle solving and traversal of skyward sword, the different weapons and move sets from wind waker, the upgrading and resource collecting from skyward sword, the go anywhere but you might get rekt from zelda 1, the few tools that the game knows you always have like albw, the large open world of wind waker except with a shitton more land, the npc routines like MM, etc. etc. etc.
if they nail the tone, the lore, and the story this could be the culmination of the entire Zelda series