I read an interview with Ancelotti saying he likes to develop a system that works with the players he has, and not limit himself to one style. My take on that is that it's not an immediate fix. He has to learn enough about the players to see what they are capable of, and see what he can mould the side in to.
One noticeable difference from the Duncan games,.is playing out from the back. Duncan all but abandoned that from the game and instead missed out the midfield. I suspect cos Duncan knew where the issue was, but it worked and we looked a better side for it. Ancelotti has now seen that issue first hand, and if he wants to play out from the back, then he's either going to have to work with the midfield, or bring in new ones. I'd be disappointed to see a side with morgan and gylfi starting again. Neither should be anywhere near the side.