Seems decent to me
Start button - meh, but it's for the real novice users who are floored by not knowing about the Windows key and do EVERYTHING using the mouse (trust me, many people are not aware of ANY keyboard shortcuts).
Updates to Start Screen... useful but I don't hate it anyway, a full-screen menu at the one time you cannot, by definition, multitask, is fine to me.
Flexibility for Metro apps - sounds good though I'll wait to try it.
Boot to desktop - nice.
IE11 - I'm impressed they finally supported WebGL because now everyone does. Though presumably it will not be coming to IE10/Win7, or does anyone know differently that IE11 will work on Win7?