I think Mancini is a very average coach and he'll hold them back again. I don't think signing the likes of Ansaldi and some Turkish fullback really changes much. Although I do think Banega is a good signing. Personally I believe Icardi is one of the most overrated players in the league and disrupts their attack with the way he plays (in that he continually tries to get in behind defenders rather than ever helping in building attacks so he is almost always not in a position to receive anything other than the perfect ball). Anyway, they're not going to be any threat until they build a stadium and therefore actually have more than 200m euros in revenue a season. Midtable EPL clubs will be making more than them next season.
I'm assuming we're playing 3-5-2 this season again, so I think Pjanic and Pogba will be starting midfielders. That means Khedira, Lemina, Marchisio when he comes back, and supposedly Matic fighting for the other spot. I know Khedira didn't play in the DM spot typically last season, but he can and I believe he'll do so more this season