The Elder Scrolls already has that, doesn't it? You kill people wearing armor, and you can get that armor, the same with weapons, and animals generally won't have armor or weapons, instead, they'll have things like meat or hides, things you'd expect to find on them, so I see no reason to think Skyrim will break the trend. I suppose I've occassionally seen animals in Oblivion having a couple gold coins, but I always assumed they just accidentally swallowed them when scavanging through garbage or eating corpses, it's not like I've ever found animals with steel armor or anything.
Infact, Morrowind was probably the first game where I didn't recive random loot. If I killed a guy, I would be able to get the armor I saw he was wearing instead of some random stuff.
I think it was also the first game I played where enemies would always drop loot appropriate for them, actually.