Urban black is definitly black (with a very, very slight hint of grey) which in the case of the camera is caused by the brushed and not polished look. The reason why "urban black" is left in English in the Russian web pages, is because it is the Name of the camera as well as the colour of the camera. The manifacturers insist that the names are left unchanged (not translated) because it distinguishes the types of equipment (camera, phone, car, etc) from each other, it gives them a name and it captures peoples' imagination.
Hope this helps