The most important change which I am looking forward to seeing at City this season will be the change of tactics and formation to a more attacking 4 3 3 line-up;
RM was overly cautious and played with a very crowded mid-field, which dominated the possession numbers without producing matching numbers of shots on goal. Hopefully that will change with 4 3 3.
RM signed Nasri as a back-up to Silva, but then played them together and over-played Silva even when he was injured. That should stop now with better rotation and more options.
RM played Yaya week-in and week-out no matter how poorly he performed, making everything go through him, which slowed down many promising plays. Hopefully that will change with 4 3 3 as Yaya will have to get fit (drop 20 pounds and stop lollygagging around) and demonstrate that he is a genuine box-to-box midfielder as advertised by Barca. Somehow I doubt it, but maybe he will surprise us all. Or maybe he will be part of a rotation now with Navas and Fernandino added to the midfield ranks, and based on performance not on name alone.
I also look forward to a better blend of star players and promising younger players. I believe this will be the most noticeable improvement leading to better results and more consistency in our form.