If this isn't communicated correctly why as a gamer would I wait a whole year most likely not knowing there is an xbox pro to buy a console ? I'd go with the ps4 or the xbox next. If the ps4 is better than the xbox next then I will buy that and skip the xbox pro .
At the same time if you announce both Xbox's at once people will skip buying the cheaper xbox and wait for the pro. Which puts everyone in a holding patern as ms releases a still born product