FrekyDoogal

One great thing about how the AoS lore has been handled and written so far is that GW clearly intends to leave room to introduce new units in the future. Aside from the aforementioned factions with new units mentioned, there's also the Daughters of Khaine, where it's heavily hinted there's more Melusai that isn't just the types we have right now. There's also the Skaven where a whole Great Clan went through a gnawhole in Aqshy, and has been missing since then. This way if GW ever wants to make a new Great Clan along the five we already have, they could simply reappear with a new theme (though I presume we'll get updates to our current great clans first before that).

Hm, didn't Wrath of the Everchosen come with siege rules? Would they come with two siege based rule expansions in a row?

That's their primary currency, like gold.

It's Warhammer Fantasy lore, which I think is still relevant here since it's the same Grungni, Grimnir and Valaya as from the Old World.

Yes. To elaborate, Grungni, Grimnir and Valaya all sprouted into existence together, and Valaya is married to both Grungni and Grimnir. So they are all brothers and sisters and husbands and wife. It's not really blood-related, but they are referred to as such.

I believe it's been mentioned that Nagash wants to have nine Mortarchs, the same as his Nine Books of Nagash. If that is true, we will get 4 more Mortarchs on the way, and each Mortarch is basically a demigod in terms of power and with their own personalities. Here's hoping for a Deadwalker Mortarch and a Deathrattle Mortarch (Krell?) each leading expanded zombies and skeletons (in the wight aesthetic).

I actually like the idea for Destruction, splitting up Gork and Mork (and maybe eventually them having their own models too), but I do not think that Death should have another god on the level of Nagash. Death is characterized by Nagash's absolute order and iron grip upon it so that there are no genuine threats from within his own faction, the extreme opposite of Chaos where they bicker with each other just as much as the other Grand Alliances. Order has that internal strife as well, and Destruction is.. Well, destruction. Death not having as much of that gives them a reason to exist without just being the other Alliances but more. That being said, that does not mean I don't think that Death shouldn't have internecine conflict. They should give Ushoran a model and bring him back to openly defy Nagash with the FEC that he can wrestle out of Nagash's control, and having other Death factions that turn against Nagash would be quite interesting as well. That being said, they shouldn't be god-level or capable of stopping Nagash themselves - just powerful enough to pose a threat that Nagash cannot destroy without committing his full attention. And seeing as Nagash is waging a war against 3 other Grand Alliances as well, he will not have the ability to give them his full attention. Basically, Nagash should be the supreme power of Death, and those fighting him should operate more like rebellious cells that cannot overwhelm Nagash themselves, but have to pick and choose when to fight to take small victories on the fringe of Nagash's grip.

While I agree with you about the Sylvaneth, I am very dubious about the Grotbag Scuttlers being meant to just be conversion bait. Unlike most everything else mentioned or hinted at, Grotbat Scuttlers actually are capitalized as proper nouns and called as such all the way since Kharadron 1.0, and have been mentioned in Gloomspite and the new Kharadron 2.0 battletome as well. The reason I feel strongly that they are a planned faction is because the last faction that was mentioned in a book with capitalization in the middle of a sentence was Idoneth Deepkin in the Daughters of Khaine book, and we know what came of that. Basically, if they were just meant to be goblin sky pirates, they probably would have just mentioned them as "grot sky pirates" or other such descriptions instead of the exact same faction name every time, capitalization and all.

I want to point out though, rereading the story point and how it goes along with newer information from people with a copy:

Yeah, I also watched the video, and from what I can see, that is basically how it ends.