I wonder if the weird mention of the in Phandalin & Below: The Shattered Obelisk would have play a bigger role. I would love to see stat blocks for them, they're my favourite D&D monsters that haven't gotten 5e stats.
Reading Exploring Eberron, I am so far LOVING the planes section of the book!! The planar effects are so freaking flavourful, unique, and fun! I'm totally swiping some of these planar effects for my own campaigns!!
This Monk subclass is pretty half baked, IMO. Needs some work.
I like the Warlock idea! I agree though, giving more flavorful and mechanically useful vestige options would make it a lot better.
Romantasy is not necessarily my cup of tea, but this does sound intriguing. I like that WoTC is 1. getting high-quality authors to work on their books, and 2. expanding into different genres and avenues. It bodes well, not targeting the same demographics that have already been saturated. And the...