Anyway Ion told that there will be Drust story in that location. If Drusts will get some lore, so by the fact this territory will not going to be Night Elves only. Probably there will be some trolls and taurens too.
Like I said Tyrande is not a druid. Probably she will just play a role in attempt to rescue her race. Currently Night Elves are dying race. She have a chance to restore population using Night Fae magic.
It will probably be just one story in many stories of that location.
But those aren’t part of the horde trolls. The playable trolls.
“It’s okay if someone gets genocided as long as they are not playable.” heard it first here folks. The summary of all Alliance morality and sense of justice.
Uh what? We also genocided the burning legion, is that not okay either?
Burning Legion/Demons are the most obvious bad guys ever. Races like Gnolls and Trolls just want their rightful lands back. That is not an evil goal to archive.
Don’t bother explaining, they have big claims and demands and no sources to back them up other than headcanon, next thing you’ll hear is Troll #343782 was the first mortal druid according to Zarao and co.
btw Stolen from US forums 
:
Question: Will Tyrande become a villain? Or will she get justice for people? Will the Night Elves rise above their relentless suffering?
Answering: Steve Danuser
* “The Night Elves have taken some shots on the chin in Battle for Azeroth, for sure. Tyrande is one of the most beloved characters and in all of Warcraft canon, and, I don’t want to speak to datamined broadcasts and things like that, but we will see Tyrande have some conversations with some of our other characters as we wrap up the Battle for Azeroth.”
* “That’s a storyline that we definitely want to pay off and we have some interesting things in the coming expansion that I don’t want to spoil but I hope that Night Elf players get to see a new side of her and their culture in a way.”
He dodged the “Will Tyrande become a villain?” part
I’m not sure i’d trust whatever steve danuser says his self insert is basically blightcaller 
Trolls weren’t world ending threat, (maybe besides Atal’Ai) Farraki were just living in their own city and minding their own business, but then looters came in just to pillage them and get their shinies. It was players fault that they joined Twilight Hammer later.
What about Drakkari? They were the ones fighting off the Scourge.Meanwhile not only we sabotaged them but helped in their downfall. Why?
What About Amani? They were Teldrassiled much sooner than Night elves.
https://gamepedia.cursecdn.com/wowpedia/thumb/1/17/Troll_Wars_magi.jpg/300px-Troll_Wars_magi.jpg?version=c250c90cea0eb2ddca69c024b9984e5f
Few expansions later we met some hostile weird night elves, that willingly joined the Burning Legion and also had inner rebellion but we helped those instead because one mana addict asked.
In other words Night elves are getting Amani treatment, but they still didn’t raid the racial leader yet by both factions.
New interview - There will be some stories about Loa and trolls.
I hope now everyone happy. 
btw offtop, on Warcraft Birthday in Coverns of Time, there are banners of all races. Interesting that Night Elves banner is now Kaldorei banner (not Darnassus). While Forsakens banner is still with Sylvanas face.
Good. Hopefully that bit opens some eyes and certain people stop being stupid with stuff like Blizzard hating Night elves, Horde bias, etc.
No, I wanted Tauren stuff, At this rate I’ll never be happy! Neverrrr!
Can’t be happy until all troll lands are restored. We need to kick humans and dwarfs outta there.
Atleast trolls still have their people and civilization
Gurubashi, Drakkari, Dark Trolls and Amani just killed. They heavily disagree with you.
None of those are playable, next I’ll cry about Murlocs losing their lands.
“Genocide is okay as long as it isn’t US that gets hit woth it.” Keep going Nightelf fans. Keep going. Peak entertainment here tonight.
I mean we don’t complain about those night elves in Wailing caverns getting killed so…
You need to read better.
The Murlocs getting genocided is horrible too, shame on you for not even bringing it up.