I know you're all about new specs and races/classes but really, they are not needed at all. But, only if Blizzard have some to put in their stead that would be equally appetizing to players. And Druid's only got a 4th spec to split the Feral tree. That is the sole reason.
And a lot of players would gladly take all new models for the older races if they were all available at expansion launch over a new class/spec, I'd wager. Granted, I don't see the big deal over new models but still, people have differing opinions.
Just to point out, I'm not against introducing a new class or race, btw. Just incase it seemed like I was arguing so heavily against them lol