Guild Wars 2

You know guys, I’m not an expert about GW in general, and I played the previous games only recently before getting the 2, but I noticed that the story we are playing through is pretty much a more complicated version of the previous one, but follows exactly the same pattern, and that is Undeads.

To sum it up:
GW1 GW2
Lich Necro Zhaitan Dragon
Undead minions Undead Orrians

Ok, i don’t remember exactly about the undeads in GW1 but I remember they had a big part in the Prophecies.
My point is: in the end, we are fighting dead corpse come to life, again.
Of course the difficulty has increased, and since we are talking about 5 races fighting all together, we can’t except to fight any common necromancer, but only a dragon.
Infact now we have got dragons throughout the world.
My question is:
Do you think that IF a future expansion would be released, this would involve creatures or enemies inspired by previous enemies (abominations for Cantha and violet demons for Elona)?
Or they would create something completely unique, maybe related to something entirely new (like a completely new and unique kind of monsters and enemies, at least for the GW2 scenario)?