Ok, now is my turn.
1. Splitting in Starborne and Coalesced.
To be honest, instead of spending the effort and time on creating 2 armies in 1, they'd better made a single good army. I just have a bad feeling that we are getting two mediocre forces instead of a single good one. I just can't imagine how good the coalesced have to be not to need the LoSaT. But we'll see.
Contemplation is not changed, which means Slann will still know only single spell from our lore. So much for the greatest wizard of Mortal Realms. Arkhan laughs at them, rolling on the floor, as well as no-name wizards from Hallowheart.
Sacred Asterisms are great. The change was obvious and very much needed. I hope, there is a way to change them during the game too. "Specific units" line is very promising, so you can give Slann +1 for casts, +1 to charge for saurus blob and reroll 1's to hit to razrodons. Would be nice.
What is plain bad is that they expicitly state, that there are only two universal abilities, which means that Masters of Order is probably gone (or just moved straight to the warscrolls maybe?)
The shown abilities looks a bit meh. Why not just +1 attack? Saurus still has only single attack on their warscrolls. Why only jaws? It also makes us want to play around this ability, taking MSU 20-30 saurus blocks (maybe saurus are capped at 30 now?). Or just ignore bonus and take spears, since more models hitting is still better than +1 to-wound and rend, IIRC. I hope, they don't change woding of Carnosaur/Dread Saurian jaw attacks. And maybe they'll rename Cold Ones' bite to jaws too? Then it is way more interesting. But still looks a bit underwhelming.
Scaly skin is nice, but it won't be useful against lots of D1 attacks, which are pretty common. And there are still so many units, like Plague Monks, which are like "I made a successful charge, please remove your unit". Looks ok.
No bravery modifiers are nice too, but not much better than Unfeeling. It can be desicive against armies that use negative bravery modifiers as a base tactics like Legion of Grief. But they aren't tend to be too powerful anyway.
The Starborne are not too exciting either. LoSaT is nerfed just because, but I can live with it. From the other hand, Arcane Vassal now holds more value. Unfeeling is ok. I like not to care for bravery at all.
2. Subfactions.
Dracothion's Tail is great. I think, it worth sacrificing Great Rememberer for it, because it has enough deep strike capabilty in itself. And no more point taxes. Shooty armies will like it a lot. And you still can LoSaT slann/astrolith and summon from it. Great.
Fangs of Sotek changed from saurus-centered to skink-centered. 3" move in the first turn doesn't looks like a lot, but it is still nice to move a Bastiladon 3 more inches and +3 move for Ripperdactyl combined with Hunter's steed will guarantee charges on turn 1 for the most battleplans. Almost like a shadowstrike, lol.
Koatls Claw is now about Sauri but... +1 hit only on charges? Like, Petrifex get universal +1 to saves just because they have come to fight. I hate this "do a lot of stuff to get a bonus which other factions get for free". It could be at least charge or was charged. I wouldn't complain, if Warrions didn't have only 1 attack on they scrolls already. But this and Oldblood's command ability get's us to 2+ to-hit on basic weapon and 3+ to-hit on jaws. And our mounted units will love it. Especially if Scar-Veteran's ability remains unchanged. And, of course, Carnosaurs will rock. I really hope, I can build an effective cavalry list with 2x Carnosaurs and 20 knights as a base.
Dominant predator is good, I guess, but we have to look at the abilities first.
Thunder Lizard looks intriguing and I like the reference. I wonder if we can use Bastiladons as battleline too, since I don't have any Stegadons and my wallet won't handle them.
3. Top Warscroll Changes.
If they are really the top, then we a screwed. But I hope, this is just GW's "be excited" thing. Trog's scroll hints however that Slann will have the same +1 to casts and unbinds and unlimited unbind range. And Kroak's spell is good. Even if he isn't a Hero, he is definitely useful now. Depends on price, but he looks like a nice support which can hurt, if needed, like Engine of the Gods.
I covered Sarurus changes already. I need a bigger picture.
4. Bound Endless spells.
This is great once again. Don't even need to comment.
In general... well, I am still neither excited, nor dissapointed. Nothing is like "wow, this will rock" but not weak stuff either. Waiting for more, because any single trait, spell, command ability, artefact or warscroll tweak can change everything.