So yeah I know one trailer is too soon to draw any conclusions, but with Tzeentch they really hit the right note. I love the damn birb, Khorne can't really play in THIS league.
Aesthetically they just NAILED Cathay, full stop. Avataresque (or Hunanesque) floating mountains was a BRILLIANT choice and I can't wait to see the campaign map and cities of Cathay. I was really afraid of them going into "insert your stereotypical Chinese mobile game" design route, but yeah it was totally unfounded. Hope to see many more Chinese mythological creatures, from temple dogs and qirins to walking turtle fortresses. I think it is now a justified bet we'll see a lot of them.
The bottom line is that both races blow Kislev and Khorne to smithereens. It's really no competition. With Khorne of course there has always been a caveat of him being originally a one-trick-pony. Kislev though... Those of you who regularly follow the forums know that I didn't really like Kislev in it's current implementation. Well now you can see why - it looks so uninspired compared to Cathayans and a lot of ice ice ice being repeated all over bears bears bears.