The Surface, VivoTab and other Windows RT tablets come from a tablet - first perspective: they're slate with optional keyboard accessories. (laptopmag.com)
Besides HDR support and the processor upgrade, the major difference with the previous model is the addition of the S - Pen and the detachable keyboard (although you could by optional keyboard accessories for the Tab S2). (ubergizmo.com)
The whole thing runs on Windows RT 8.1, and like the Surface slates, can be used with an optional keyboard accessory called the Power Keyboard. (technologyguide.com)