How many times does MS decide we users really want a new UI and force it upon us when nobody actually wanted it, only to eventually revert back to what it was? In this case they appear to be wanting to emulate Apple. No, just no. If it ain't broke, don't fix it! I'm sure they have focus groups made up of willing sycophants to back it up, but time after time it's the same bs - just feels like a few high-level 'designers' in MS making changes for the sake of change, and perhaps also in an attempt to legitimize the salaries MS is paying them. Many iterations of MS Office have been the same - few new features, but rearrange all the menus and shortcuts to make it feel like you're getting something new, when mostly it's just a rehash and an inconvenience in having to learn the new menus and shortcuts and unlearn what was in the previous iteration.
I'm not against change, but make it worthwhile, not just change for the sake of change.