I think that they've just changed how wide the "pivot" point is for each thing (look at how the start screen flips out a little then inward like in Windows 8.1?), and also sped up the animations, which leads to the user thinking apps now launch faster (when they probably don't, as we saw the dreaded resuming dots return in Battery Power Sense). I'm glad that they kept some aspect of the panoramic app layout and animations for that as that made WP really unique to me. The textbox selector animation has also changed - instead of individual text flipping over it's more like blocks of pixels like shutters. Also for the person wondering about the file manager, we do know they have added a file picker so one can only assume they need something to manage that