I doubt anyone knew Sylvanas was going to burn the big tree. I doubt that it was even Sylvanas’ plan A, B, or even C for that matter.
As for those “leaks” on the Icy Veins forum, yeah some make sense but most are just way too out there to be even remotely plausible. Will see soon enough anyway.
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The Night Elves had it coming, honestly. It wasn’t Sylvanas that turned the corrupted world tree into ash, but their own hubris, instead.
Looking forward to new models and heritage storylines. Hope there won’t be any new allied races though. This game has enough races already.
Wasn’t said tree cleansed and blessed by Ysera and Alexstrasza?
Didn’t it need all their blessings to not be corrupted and one of them was just, “no”?
I think they cured the tree of corruption, but Nozdormu refused to grant back the night elves their immortality.
All of the leaks are really dull so either people are bad at faking stuff (very likely) or blizz don’t have any good ideas (also likely) 
Quality fakes. Not quite at the level of WoD’s “orcs created the emerald dream” but about halfway there.
As we say in Manchester:
“It’s just a load of sh!t.”
They all just come off as wish lists or common ideas and theories.
If it lists ‘Tinkers’ I immediately assume it’s fake, they’re all saying it now suddenly because of mechagon.
At least we’ve stopped seeing Tel’abim in every single one now that we’ve had our “south seas” expansion.
It’s a bit of a shame, I’d actually like Tinkers but I know they’d be gnome/goblin restricted. Which would suck because it’d be predictable as hell, and honestly with how every race can “easily” copy class animations now with the new rigging there’s no development reason they couldn’t make it a global class. I mean, if every race can be an engineer… what makes tinkers different besides making their entire arsenal engineering related?
Demon Hunters I expect were restricted because: A) Lore. It’s always been heavily an elf-thing and frankly it’d be weird to see a non-elf DH given the class history. And B) Metamorphasis. Trying to make two demon form models for every race and gender would suck.
If they do tinkers I rather hope they look at Wildstar’s engineer for inspiration. A massive portable cannon, charge packs, heavy armour (RANGED TANK BOIS), robot pets (Optional pets I must add), etc. That was a really damn good class and I’d prefer if tinkers were that rather than just some weird version of hunter but with gadgets or warrior but with some re-flavoured abilities.
Tinkers make sense because they are a class that can conceivably wear mail, heal and use guns - all of which are things that are a gap in current classes.
Watch Blizzard pull a fast one and add yet another melee leather class.
And yes it uses agility as it’s main stat.
I was hoping for a ranged DH spec, don’t play with me like this : (
https://us.forums.blizzard.com/en/wow/t/8-2-5-ptr-development-notes/237019
Party sync could be cool.
No vulpera announcement though 
Glad we’re getting Bard then 
tbh a part of me hopes they add new specs rather than a new class.
Captain - Warrior - If you’ve ever played LOTRO this’ll be familiar, leading through combat inspiration and battle-cries. Basically the heal-through-damage thing like Disc except not as sucky.
Battle-mage - Mage - I’ve been wanting this for years. A mage spec that lets you use mail and two-handers, and depending on talent choices could tank or DPS. Like some kind of… idk, a “stance” mechanic, or is that too much for WoW: The mobile game?
And so on.
Seems to be literally the sync system from FFXIV, depending on how far down you can go. XIV handles it by having a ‘leveling’ roulette which is basically all dungeons up to your current level, except the ones from the latest expansion. Rewarding a massive chunk of XP per day for doing it, as well as cash and mats if you’re an in-demand role for the queue. It’s pretty neat actually and a good way to keep the low level queues populated.
But without that I expect it to just be a means of playing low level dungeons with a friend without steam rolling everything, which isn’t too bad an idea.