I'm very glad about this. I hope there is MUCH to explore in the new areas, hidden and secret places to find and many achievements about them. Also some quests about exploration and when you explores new parts or find something, you should get exp points too.

I would like also a npc that incentives you to explore (similar to the selbina clay quest), maybe about searching for ruins and writings to find around the world. And everything you find, you can archive the lore about them in a book (with art too if possibile). So as the 'famous' monsters-book Jynx suggested in an old topic (i would make also a 'nature' book about flora and plants/flowers to find through harvesting too).

For the old aetherythes, yes, they should reset them or leave only some of them (in any case you have to explore the zone around the aetherythe could you have). And you shouldn't teleport someone who still not reached that aetheryte..

About jumping, it would be sweet to have some places to reach with it. Some platforming elements would not ruin the game imo.