I know that the core game hasn’t advanced at all on that front since the release, but I would like to talk about the relations between humans and centaurs and how they could evolve in a LS (I don’t see this plotline being able to support an expansion, but it is also too big to be just a subplot in an expansion, if you ask me).
From what I’ve gathered, the situations at the beginning of GW2 has some similarities with the relations of Charrs and humans before Prophecy :
-the centaurs sees the humans has invaders and the humans claim that they have held the lands long enough to be them now, just like the Charrs and humans saw things before the Searing.
-The Centaurs are dominated by one of their clan/tribe (??) just like the Charrs were dominated by one of their Legion.
-the humans are highly divided and unable to mount a coherent defence.
However, there is also one big difference : the two sides in the human-centaur conflict have lost much of their territory. Kryta is the last human kingdom and is effectively land-locked, since the lands south of the Ascalonians settlement seems to be at least partially independent from it. And the centaurs have lost even more lands. They are probably stuck with a tiny bit of the Shiverpeaks and Woodland Cascades as their core territory, and had expanded quite a lot just before the release.
However, the core game experience sees the players repel the Centaur invasion from the gates of Divinity Reach to the northernmost corner of the Harathi Hinterlands. And while it is only my personal belief, I don’t think that they have left most of the centaur ’s forts empty. While the campaign is quite quick in the gaming experience, it is reasonable to suppose that the Krytan forces drive away the Centaurs one region at a time, before they finally gather their forces in the Hinterlands (I know that the Centaurs are still there in the Kessex Hills map after the Tower of Nightmare, but since none of their events has changed, to my knowledge, I must assume that it is just a design choice, not a lore one).
Therefore, it is believable that the Centaurs, having lost their leader (Ulgoth) and most of the territory they claimed (thanks to the work of Caudecus and his bandits/White Mantle cronies) they must be quite in disarray. But as I’ve said before, the centaurs are in a situation where fighting the humans is probably the only way to prevent a total collapse of their population. They are probably far too numerous and crowded to survive for long in a relatively small corner of Tyria by themselves. We have seen that, at the very least, their armies don’t care about the damages done to the land since their bastions are usually surrounded by barren lands, even when the rest of the region is verdant.
So, I assume that being in this state, attacking them in the Woodland Cascades would drive them ever deeper into despair and they could go ever fiercer as the players and the npcs would advance into their territory. Obviously, the humans are probably able now the crush the centaurs, with only a little help, and claiming the Woodland Cascades and every land surrounding Lake Viathan, if they haven’t done that yet, would bolster Kryta, by offering new lands to all the poor people gathering at Divinity reach and turning to banditry to survive, with the right course of laws from the Queen’s faction in the Ministry. It would also greatly secure the position of Jennah.
But is it the only course of action ? We have seen that there exist some centaurs who are friendly toward other species. Couldn’t they help the humans to broke a peace with the Centaurs ? I mean a peace or even the truce like they did with the Charr is probably out of the possibility (because of the lack of territories from both side, contrary to the Charr’s huge swath of lands and Kryta being far more wide than Ebonhawke), but couldn’t there be some way to end this war ? Perhaps a system like the Austrian-Hungarian throne back in the XVIII-th-XIXth centuries ?
What do you believe is feasible ?