This article got me thinking. One reason was the picture below.
Note that each device on the slide is distinct, not just by name, but also by form factor.
Traditional Desktop, with monitor, CPU box, keyboard and mouse. Laptop, with keyboard and touchpad. Tablet, now this has generally been used to mean a keyboard-less device like the iPad, but here, Microsoft is using it to mean a convertible, basically, a laptop with a touch scene that can be turned to become a tablet. Next of course, is the Slate, which most everyone else calls a tablet, no keyboard and obviously it would have a touch screen. Next is a Reader, and I am going to gloss over that for the moment, other than to note that it appears to be smaller than a slate, and used in portrait orientation, rather than landscape orientation, like the slate. Then we continue down the size spectrum to the smart phone, and finally finish up with a TV, which is already an important device for Microsoft when used with the XBox, though I and probably many others use our TVs as a second big screen monitor for watching Netflix, Hulu and movies.
What if Reader is just Microsoft-speak for 7" tablet?
Walk with me as we take a trip to Redmond. You are part of the Microsoft team, and you are planning for Microsoft's dominance across all platforms. You want Windows on everything, but there are going to be differences depending on hardware. We know that Windows 8 is going to run on a lot of this, and Metro on all of it. The TV will run Metro (that's the Windows Phone 7 and Windows 8 UI, by the way) either through an XBox, or some other TV box, or possibly even on the TV itself. Everything else is going to run Windows 8, or something based on the kernel, since Microsoft has already said that Windows Phone 8 will be based on the Windows 8 kernel and not on a Windows CE kernel.
Desktops, Laptops and convertible tablets will all run Windows 8, at least if they are Intel based, and if they are based on ARM, then they run Windows on ARM (WOA). So, why separate Slates from Readers? Well, one reason could be usage, and that is what is discussed in the original article. Windows on dedicated eReaders.
But, I have another idea. What if Readers are just small tablets, say tablets with screens 7" and smaller? If they are going to run a different variant of Windows, then they would need to be differentiated on the slide. We already know there will be two versions of Windows 8, one for Intel and one for ARM, so why not a potential third variant, Windows Reader (because of the name on the slide and for want of a better name for the moment). Maybe, it would be a version of Windows Phone 8 optimized for the larger screen. Or maybe it could be WOA with a few features stripped out.
Will the legacy desktop be any real use on a 7" screen? What about a Reader version of WOA with the legacy desktop stripped out of it? So far, there are at least two Reader apps in the Windows 8 store, Kindle and Kobo. What if the "Reader" won't be a dedicated eReader, but just a small tablet? Maybe Microsoft will let OEMs tweak the UI to focus in on their reader app, but maybe Microsoft just sees 7" tablets as being something that doesn't need the full power of legacy Windows.
I don't have any special insights or sources at Microsoft, and I doubt that any of them are going to be talking at the moment, so this is just speculation...but it does make for interesting thinking.