You can now edit the Tools that are in your Tools panel and how they are arranged in Photoshop & Illustrator.
You can now import PDF comments directly from a reviewed PDF that will apply those changes to the document
You can now adjust page size and margins and InDesign will automatically adjust page content
Workspaces are saved, preset arrangements of panels in Adobe programs. This short video explains how to switch between them, customize them, then save your own.
I’ve been using the new features of CC 2019 since late last year, when they were released.
Illustrator CC 2019 includes a new way to select then edit multiple similar objects at once.