I like how Rebrand A looks, too! However, it would be such a big change from the previous design that people would not recognize it. If we want to reopen the discussion then it would be interesting to see a design similar to Rebrand A, which reslices a sphere instead (slices would be circles instead of rectangles; or at least the rectangles would change in size to form a sphere-like shape).
@wenples What do you think about the icon set redesign discussion? Would you be interested in/available for designing a modern icon set for Slicer?