Which, honestly, I expected. However, some of the files imply that even the Challenge Mode gear will be Orc-themed, and that I'm not okay with. Coming off of a full year of Siege of Orgrimmar, I think the Orcish themes are already going to be fighting fatigue, but for Challenge Modes, I think it would be a poor choice -- particularly that MoP's CM's set the bar for Armor so high, in that most of the sets reflected the Class, not Pandaria specifically (though a few certainly did).
Again, though; for the leveling/questing rewards, it makes completely sense, along with Draenei influenced designs (and I'm eager to see more Arakkoa weapons, if there are any). I just worry, since several Blizzard artists are obviously huge fans of the Orcs' general aesthetic themes, the game might wind up with a bit of overkill. Hopefully that isn't the case, but it's definitely crossed my mind...