Well there's already hours upon hours of footage from the first zone that you can check if you want.
That zone feature a dozen of different boss, some inside caves or ruined castle, some outside or at special places. A few of them are gigantic and require open space to navigate and fight, like the dragon, some huge giants or the very mobile mounted knight.
There's several NPC to find and interact with. Lots of small caves, some bigger. Various loot, many hidden, including a few complete sets of armor, some spells, some summoning runes. There's also many "campfire" to activate and teleport to after for quick travel. And a very fast mount to unlock. And all of that in the first area which is less than 20% of the world, with a map without any "?" markers...
So i'm quite confident for the entire map to be full of interesting and unique(and deadly) encounters and discoveries.