Dragonflight still sounds more like a working title than official one, but while some of this sounds interesting, other stuff sounds like just the usual "disguise every common player wishlist item as an entire expansion" shtick. Running with the concept though, the idea of an expansion that's sort of a sequel to Legion is a cool direction. Sounds like something that should've been in place of BFA, but I really hope they dont recycle dalaran for THE THIRD TIME. It's not even that cool of a city imo. Also, I was hoping Blizz would've learned their lesson from cata about disconnected zones being worse than cohesive continent or world to explore. Portaling around the world is boring.
That being said, Chromatus as a boss would be intriguing, but also a tad dodgy given it's a villain who only ever made appearance in books outside of the games, and was even scrapped as a boss for Dragon Soul. He does have a really cool design though as this draconic mutant hydra monster. As much as I want a simpler adventure though I wonder how they will keep this expansion from feeling as left of field as BfA or WoD.