I just love the part where Engadget talk about how the USB works, it seems to REALLY work as a standard PC USB, not removed of any fucntions at all!
I've been saying this for months. RT will work with all USB peripherals just like any Windows OS does. Some things that requirre specific drivers wont work, but Windows has drivers built-in for literally hundreds of thousands of USB devices. It's a massive advantage over other tablets and gives Surface and any other Win 8/RT tablets more accessories/peripherals than Android and iPad by miles.