Via the (presumably freshly updated) Age of Sigmar App.
The following screenshots are, I think, the totality of newly named factions.
Oddly, no new names for Dark Elf models, nor Wood Elves. One may wish to contrast and compare with the current 'Last Chance to Buy' section - though from what I've seen that's mostly either quite old kits, or Finecast.
One observation....your basic Elven troops aren't yet classified into their own faction - yet the relevant kits for Woodies and Dark Elves aren't in the last chance saloon.
I got nowt to back this next bit up with, but I reckon we'll see the basic High Elves return before long - albeit resculpted and sans ham-Hock-hands that would do a Slayer proud!
Alsö wïk....Dispossessed it would seem are a separate faction to the 'talked about in the background but your guess is as good as mine' Steamhead Duardin....