See the broadcast text.
http://www.wowhead.com/news=283532/b...moore-spoilers
She is a Horde only champion in legion already so this may not be a big surprise. Though I personally do hope she could remain an undead not affiliated with Alliance/Horde.
And some inputs of forsaken culture from Lilian's perspective. Hope Blizzard could finally give forsaken some development on racial identity beyond Sylvanas.
This move also technically makes it possible for Lilian to lead forsaken at some point, even though there should still a long way to go from being a member to being famous/powerful enough to contend the leadership position.
Lilian: It's not exactly a science, becoming Forsaken. You might stay the same, become a completely different person... or maybe you might actually just die.
Lilian: No person should think of the Forsaken as a second chance for anything.
Lilian: Terrible. Those that don't shun you will never treat you the same again. You look in a mirror and all you'll see is a monster, something that isn't you.
Lilian: But... there is a bond in this curse, shared by all Forsaken. A bond that makes us family in this torment. A family that will never go away.