I'm not expecting every race to have meaningful appearances on every patch, but gnomes haven't done anything since failing to take Gnomeregan back in the pre-Cata event
Worgen? Nothing since their starting zone (Or the undead 10-20 zone)
Night elves? Fodder to show how tough orcs are in the books and to show how "smart" Varian is in-game.
Dwarves? Booze-jokes and Archaeology NPCs
Draenei? Velen has a bit part in an out-of-game short story, otherwise nothing since Velen cleansed the sunwell for the blood elves (Totally logical move there BTW)
This isn't an issue of "No new lore for 6 months"-kind of deal, try years without anything meaningful...