Orcish armor was in Morrowind and Oblivion, I'd assume that what we're seeing is just Skyrim's version of it.
Anyway, although they're all images that can be seen in the Art of Skyrim video, it's nice to see some larger, still shots of them, doubt there's much about them we can anolyze that we haven't noticed already at this point, though.
I agree, orcish and elven armor were in the previous games. I dunno, its just weird to see it called Orc armor, rather than orcish. Probably just looking too deep in to it though.
As to OP, I was agreeing with you. I was just saying that if that were the case, I would still want lots of other choices for armor. It would svck if your Orc could only wear orc armor. Not that I think that would ever be the case.