Microsoft has introduced its thinnest and lightest Surface tablet yet, and I know what you're thinking: no, the Surface 3 isn't the long-rumoured Surface Mini.That said, the new tablet bears many of the qualities you might expect from a small Surface ? it's plenty portable and more affordable than the Surface Pro 3, while packing less in the power department. And that last point is a concern.The Surface 3 is the first non-Pro Surface to get full-fat Windows 8.1, rather than Windows RT, which featured on the Surface RT, Surface 2 (and Surface 2 4G). At 10.8 inches, the new tablet is closer in length to those devices while being slightly taller due to its 3:2 aspect ratio display.Foregoing an Intel Core-series CPU (what, no Core M?), the Surface 3 comes with a Quad-core Intel Atom x7-Z8700 Cherry Trail CPU clocked at 1.6GHz (Turbo Boost to 2.4GHz), 2GB of RAM and 64GB of storage.If you want to dial up the power (slightly), a second version comes with 4GB of RAM and 128GB of storage. Both will be available starting May 7.