So many tablets are convertibles, they're not always easy to spot at a distance, which is a separate discussion.mouse gestures; mea culpa on the description
in short, every corner you click the mouse in, something useful happens. It's the Start screen rather than the startup screen (I expect that will still be a registry hack). I'm not sure why one would want a photo to be repeated as the backdrop; for almost every photo the edges won't match and only the edges won't be covered by Metro tiles. It's not like the desktop where you can peek behind the windows; the tiles are always there, always covering your photo. You can't easily change the Start Screen in Win 7, except to choose the frame colour when you choose the window frame colour (and you can tweak those colours in Metro), and we're only seeing so much of That Darned Green because we're seeing Metro screenshots. Protecting users from the Fugly; that might be a good principle for Metro 
