Looking at some of the new pictures that have been hosted showing new content we can see there has been vast flooding and lucious plant growth in areas that used to be dead.
This just makes me wonder how long it will take us then from leaving Northrend and entering Azeroth again - as it would take months to cultivate such growth.. or is this simply a plot hole.
Also I wonder why Ungoro isnt flooded.. Its lower then Tanaris, of which appears to be mostly covered in water now.