Google may change the navigation bar with Android N
Unlike iPhones, Android makers have two options for navigation bars: they can either use physical buttons or virtual buttons. Even though Google already updated the navigation bars with the Android L and used shapes, they are also planning to update these buttons again with the upcoming Android N.
As you can see, still the new navigation bars are based on simple shapes but the buttons are filled. However, the leak also suggests that the new buttons would be animated. For example, the circle would “animate in some fashion when long-pressed, with the various colors expanding in their corresponding directions until they all file out horizontally”.
( current one is the gray one / new leaked one on the one below the old one )
Even though it is just a leak, still there is a possibility for this design ( or maybe even another design ) to come with the final version of Android N.
Source – 9to5Google