Down the Metro
They did not just come up with a plain design, but a design language.
The name the design language had earned was Metro or Microsoft design language (MDL), and the reason for that is because it's modern and clean. It is fast and in motion, all about content and typography.
The start received a new fully customizable layout and you can make it the way that suits you best. You won't even have to open some of the apps to see what's new, it has Live Tiles which display the latest info just at a glance.
Unlike the earlier releases, Windows 8 is the first and only Microsoft Windows release that doesn't have the regular start button. Instead you would press in that same spot and open the new start layout where everything you care about will be there.