They have the MWs on 6s which is pretty excellent. But so far that's kind of it for decent rules.
The rest is 70% -1 to hit abilities with those awful wordy/picky rules. It doesn't stack and really isn't that exciting.
It's unlikely that they will be trash but awful rule previews don't help.
Also quite confusing to be told they are a horde army and then see all the troops are really expensive.
For myself, it would have helped if they hadn't messed up Kragnos as I worry if that's the design teams output for our god model and have lost a good amount of faith in what might be coming for destruction ruleswise.
Hoping to be proven wrong but the mortals rule isn't enough to make an army good.