"...a detachable keyboard/stand peripheral similar to what Microsoft offers on the Surface RT tablet."
"...several USB ports on the back of the keyboard dock, possibly USB 3.0. The keyboard will also have its own battery. Cyan matte will be one of the color options."
Err, Kevin? Have you ever used a Surface? The stand is actually built into the Surface and Surface RT tablets themselves. Not part of the keyboard, which is really a cover/keyboard combo. So the Touch and Type covers for the Surface are actually nothing like the one you describe, which as you stated is rumored to house USB ports and/or a battery.
Really this keyboard dock is more like what you see with other third-party vendors, like Dell, HP, and Asus - which all sell tablet/dock combos that have supplementary batteries and ports in the dock.