While them just being for the character creation screen makes a bit of sense, then why do they also have icons?
Remember last week when GC said in a tweet that a handful of the stuff datamined from 5.2 wasn't actually going live in this patch? I'm guessing these all into that category. The selection so far is strange. Outside of a couple of them, they don't seem to relate to the "signature" race/class combos, and of course there's a lot of stuff missing. No one handed sword? No shield?
I suspect that these are either something that will end up being trivial, like npc weapons, and won't be obtainable by players... OR, they're going to be related to later content that focuses more heavily on Horde Vs Alliance (where a strong racial theme makes excellent sense), possibly even the final raid tier. Though I hope we don't have to wait that long. My honest hope is that they have something for every race/class combo eventually, though that seems unlikely just due to redundancy, unless... Actually they could very well just be for transmog purposes, not actual weapons with stats. Yes, this is the theory I'm going with, I want this.