Department = Product department not sales department (good example is that MP3 players are under the computer department but aren't sold by the computer sales team)
Class (Mobile Computing) = sub category of department, Mobile Computing could refer to a tablet, a laptop, a netbook, etc. It doesn't refer to an MP3 player or desktop as those are other classes under the Computer department.
Subclass (Apple) = The subcategory of the Class, for example: Apple, notebooks, netbooks are all subclasses under the Mobile Computing class.
It's listed under Apple as all Apple portables (notebooks) are since Apple has it's own subclass in each major class (Desktops, Monitors, MP3, etc).
The item is listed as retailing at $999.99 which means it's more than likely an update to the white macbook or possibly a new product at that price point. But the reality is that unless it's something as mundane as an update to an existing product it's unlikely that Best Buy would know about it ahead of time.
The box dimensions, weight, out of stock date could very likely all be wrong, but it is NOT a placeholder.