There were a couple of bugs fixed in this version. One, which I noticed, was that the close button was not clickable on posts with a featured video. (This isn’t supported in core, but the functionality can be added with the Featured Video Plus plugin.) It turned out to be a z-index issue, and it was easily resolved.
Cover2 already has a feature where you can define an accent color in the Customizer. The default is blue, but you can change it to whatever you want. Well, almost any color. There is a restriction on the saturation and lightness, because it must be visible on white. (The navbar, by contrast, can be literally any color.)
Since the accent color is already applied to things like links and buttons, it was a simple enough matter to partially apply it to the bundled SVG icons too. (This is one of the benefits of SVG icons over icon fonts: you can apply a color to just a part of the image.)
These are some of the icons used for post formats in Cover2.