Seems like a waste to never use these amazing looking models again (or just use them for mobs/NPCs), especially since they are leaps and bounds better than the current baseline forms. Feral in particular has (somewhat) racially inspired forms - Balance of Power skin is obviously Troll-inspired, tree-kitty leans towards Nelves/Tauren and PvP form towards Worgen.
The problem with assigning skins to specific races is that it would completely negate the effort people put into obtaining these skins and lock them into a skin they may not like. Maybe we get to keep the skins we unlocked, since the basic form already has colours for each race.