The thing I'm really looking foward to about the release, is just more 'layers' in the world.
I mean, like you could have your veteran adventurer, hunting evil all over the known world for years, gaining scars and followers and being pretty darn badass, and then suddenly he stumbles upon some ancient, forgotten tomb.
And then of course, having slain dragons and hydras and titans galor, he's pretty confident this isn't going to be much trouble. So he goes in with his small army, and... Something horrible happens.
Tl;Dr, there's always something NASTIER to discover.
Also, another thing I was thinking of the other week when 'moving fortress parts' were mentioned: BOATS.
Just imagine, your average disfunctional, bloodstained fortress, filled with despair, stale booze and dirty socks, afloat, heading down rivers or across the open sea, with forgotten beasts coming from the sky, or as forgotten, barnacle-crusted things from the depths... Imagine goblin pirates trading ship-mounted ballistae bolts and arrows with your trusty crew, and eventually when the whole damn thing has been afloat for years, is taking water, you can just put ashore and build a new fort on the other side of the world.
Sorry for rambling, I probably don't make much sense as I'lm half aslee-Zzzzzz.