A “Dark Knight” is too similar to a “Death Knight” , i don’t see it happening ,or atleast not the naming of it .. i would like them to perhaps do something with the Paragon , wore heavy and was a solid range. Guardians and warriors primarily melee , so would fit to have a solid heavy range.
I have read that there is a 6th “Unamed” water dragon, So going by that alone … i would see a “waterworld” type starting area with races of Quaggan and or Krait. Elon River area … maybe?
We still have Dragons to beat …. Only dragon we have fought is Zhaitan ….. with Mordremoth opening up Maguuma Jungle, we will need to get through Jormag (far shiverpeaks), Kralkatorik (Crystal Dessert), Primordus (Ring of Fire). Then and only then do i honestly see the possibility of a new race/prof when we are to face the last dragon ( as said above, with the water dragon). If it doesnt happen at that point, then wont be til Cantha / Elona ..yes, i believe we are going back in a couple years AFTER the dragons.