Well, High Elves maintain Elven Fortress/ Fortress of Dawn at the very south tip of continent...And donīt forget that Dark Elves operate their famous Black Archs...basically floating cities - floating horde settlement
Thus the main conflict from beginning could be Lizardmen vs Skaven? And later they could easily flash out Both elven factions in similar terms as Bretonia...
This is just my thinking that takes Tomb Kings into equation...Frankly I would love if they add both Lustria and Southlands at the same time.
Lustria has more Elves but neither of continents is for Elves important as Ulthuan or Naggaroth...