Now I've only played some low level quests since the update - namely Catacombs and Waterworks - so take this with a pinch of salt but:
1) Elite doesn't seem to have got any harder.
2) It seems like 30% of mobs have a Crown and mostly this just means they take 1 more hit to kill.
3) ANY mob can be a Champion - Oozes, Spiders, Quest NPCs {Librarian Guillaume in Catacombs - He still got one shot btw!}.
4) Zombie Champions can be a real pain to a Staff Acrobat!
Why is it that every Champion I actually noticed in End-Game Marguerite was a Zombie? {80% of that quest if not more are Skeletons!}.
5) With all those Champions {even in Friar's Niece I counted 3!} I didn't see a single chest!
Feedback
1) Reduce the numbers of Champions - 30% is way too high!
2) Buff the remaining Champions better!
3) Make only intelligent creatures able to be Champions - No Champion non-named Oozes/Spiders etc.
Preferably also keep Champion status away from unintelligent Skeletons and Zombies - Most Undead quests have a few intelligent Undead around!
4) Weapons breaking is a personal bugbear of mine - If a mob has DR already it shouldn't get more DR!