Microsoft is changing its entire look and feel to become more in line with a consolidated ethos which should be ushered in by Windows 8. While the title may have changed from Metro to Modern, there is no doubting that the visual elements are settled and constant.
The new logo features the same familiar colors in a square layout that references a Window pane. In addition, the new logo also looks similar to the live tiles which have become a feature of Windows OS phones.
Over the years, the Microsoft corporate logo has resembled a disco-ball, Metallica's font and Pacman. While the new logo might not be as exciting, it does fit in rather well with the new look Microsoft is trying to establish.