Tauren Marine & Secret Cow Level

Blizzard has made a very good April Fool's joke about a new Starcraft 2 Terran unit - Tauren Marine. Of course we all understand that there won't be any tauren marines in SC 2 but it was a good joke. Under one of the pictures they wrote "there is a cow level" this may be another joke but when you think about it there was a secret cow level in Diablo 2 and there was a secret tower defense level in Warcraft 3: The Frozen Throne. So it might just be true. I mean they have already made a tauren marine unit, why not put it to use? What do you think about a tower defense maps in SC 2? I would