AdDuplex claims to have spotted new Surface tablets accessing its Windows ad network regularly. The devices that appear are named “Microsoft Corporation Surface 2″ and “Microsoft Corporation Surface with Windows 8.1 Pro.” The first one will be running Windows RT like the current Surface RT does. Nothing has been confirmed right now though, this is merely an observation. The difference between RT and Pro Surface tablets isn’t limited to the OS, Pro comes with much better hardware and subsequently costs much more. Would it make any difference at all if Microsoft decided not to attach the “RT” label to its entry level next generation Surface tablet? After all, it doesn’t really have any relation to the tablet’s performance and design, the two key factors upon which its success is going to be determined.