I think they will and here's a couple I'm hoping we'll see something similar to.
- hardcoe mode: I hope they'll have this again. It helps me get into the role of the character.
- Deadly Reflex: Knockdowns, gore, special moves, finishing moves. It makes the combat much more satisfying then clicking the mouse several times and casting a few spells till they fall to the ground. Some people can argue that this is an RPG not a hack n' slash adventure. While that is true and I wouldn't want a God of War clone, I think Deadly Reflex did a good job of retaining the RPG roots and not getting too crazy.
- Darker Nights/Dungeons: Makes being a stealthy/evil character that much more fun skulking around in shadows.
- Thieves Tools: Putting out light sources, distraction, knocking out guards, vine arrows, etc. Makes the life of a thief easier and a adds a bit more variation to encounters than just sitting in shadows, waiting for guards to look elsewhere.
My list could go on and on but would like input from other people.