I've read a number of people trying to argue that tablets are not the same as PCs and that Microsoft gets to change the rules and drop their public commitments to developers (and governments) on tablets because they're a totally different category. Well, let's take a look at what Microsoft has to say about that:
Imagine a tablet. Light and thin. Amazing battery life. Gorgeous screen. You can lounge on the couch enjoying a beautiful, fluid experience, doing the things you love to do on a tablet: playing games, socializing, browsing the web, reading, touching up photos, watching TV. You are just immersed in your experience, doing the things you love to do. You hand it to your daughter and she knows exactly how to use it.
But then, if you want to have a bit more control and efficiency, you can set this same tablet in a stand and attach a keyboard, or just flip a keyboard around, and suddenly you have a complete Windows desktop experience, with full Microsoft Office, multiple monitors, peripherals, and a mouse.
Or, imagine a featherweight laptop with a beautiful large screen and a great keyboard. But in addition to doing everything you use your laptop for today, you can also use your favorite new apps built for today's tablets.
Windows 8 imagines the convergence of two kinds of devices: a laptop and a tablet. Instead of carrying around three devices (a phone, a tablet, and a laptop) you carry around just a phone and a Windows PC. A PC that is the best tablet or laptop you have ever used, but with the capabilities of the familiar Windows desktop if you need it. You may choose to carry a tablet, or you may choose a laptop/convertible, but you do not need to carry around both along with your phone. You never think about a choice, or fret over your choice of what to carry. Things just work without compromise.
It's kind of difficult to argue that tablets are something distinct from laptops (and the waning desktop) to defend Microsoft's anti competition behaviors around Windows on ARM tablets (and soon ARM convertibles and straight up laptops) when even Microsoft is telling you that they're the same thing.