The command-wheel function lever found in the E-M1, which originated in the Olympus Pen E-P5 in a slightly different form, has been added to this body. It lets you assign the command wheels to two sets of functions, such as aperture and exposure compensation control when the lever is set to position one, and, later ISO and white balance when the lever is in position two. It can provide a very quick way to get to the settings you change most frequently. Plus, since the camera has an EVF to display the settings, you can easily make those changes without taking your eye away from the finder.
While the original E-M5 had a tilting touchscreen, the Mark II has a 3-inch 1.037 million-dot touchscreen that flips out to the side and swivels up and down and can face fully forward, which might be helpful for selfies.