I find the gameplay demos so far very disorienting, and by far the largest amount of gameplay time goes to controlling the camera rather than, what I would call, playing the actual game.
Something I wasn't a fan of in D:OS1&2 was linking the characters - esencially we couldn't control a group, we could control only one character at the time, and link others to follow him like cattle. I never quite got used to it, constantly leaving someone behind or having someone rush to me when not asked for. I think Swen said in on the the showcases they are examening it, but don't quote me on that.
