My personal thoughts on the new RoR's, basically expanded from a reddit comment I made.
I find it kind of hilarious that they marketed the Ogre Kingdom RoR as an anti-armor maneater pistol unit, and then in the patch notes it's revealed that they reduced the regular maneater pistol's AP. Thanks I guess? They do look cool though, they seem to have actual Imperial armor assets on which is very nice.
Dune Dragons are kinda underwhelming and not really something Cathay needed(and they are desperate for something!). Encourage is only like +4 leadership in a super small aura, not exactly worldbeaters. Guardian Aura or something like that would probably have been stronger and more appreciated, or some other thing to make them stand out more.
The Exalted Daemonette RoR basically being Witch-Elves with perfect vigor will be interesting, and I think they'll be very strong, but also very, very expensive I assume.
More firepower for Tzeentch is always good I guess, and as I recall blue horrors do have pretty low ammo so it might synergize well in MP and SP alike.
Better Bloodletters is not ever a bad thing, but not very exciting.
Exalted Plaguebearers with regeneration AND model replenishment sounds absolutely disgusting though, I have a feeling those fellows will simply refuse to die. I will be very interested in seeing how they are used in MP.
Tzar Guard with flaming attacks is kinda boring but not terrible.