This new Windows 8 RT on ARM device is a bit like the Asus Transformer Prime but Asus does not want to call it a Transformer Book, it’s running Windows on ARM only, no dual-boot with Android for now (my guess is maybe they change their mind by the release of this device in October or whenever Windows 8 is released). This is kind of a prototype, although the hardware is pretty much the same as the Asus Transformer Prime with Tegra3, this one has 2GB of RAM.