Of course it should be different. Aside from the fact that realistically any suit of armor would have to be tailored specifically to it's wearer for it to be of any use, i can't really take Skyrim seriously if when donning the armor in the promos the female body gets 2 feet wider, taller and a lot more muscular for some reason.
As a fantasy (ie, not realistic mideval) game, some tittilation is obviously not out of the question, but that doesn't require any exposed flesh if it makes no sense to have it. http://tesnexus.com/downloads/file.php?id=13259(the leather/chainmail combination especially), barring the somewhat exaggerated proportions, is pretty good if you ask me. Functional but 'interesting'.
Well i don't mean exactly the same, of course the equipment would have to be fitted to fit the characters, but take that picture you linked for instance, imo that would be a very bad thing for the game to have if iron armor for males was the same as it is in the vanilla game. To have males wear full suits of armor while females wear equipment like that (exposed midriff and legs and etc. would be sorta ... meh...
I don't dislike armors like that in all games (well I like JRPG's) but in Skyrim to me it would be completely out of place
EDIT: o, i think i did something to change the pic because i went back to look at it again and now it has chainmail under it, but my point still stands although a little less.