Hulu integration into Disney+ is in Beta testing for people who subscribe to the Disney bundle or have Hulu w/Live TV (which gets you Disney+).
This is a HUGE improvement for Disney+ and now (finally) puts us on par with the rest of the world as far as having a steady flow of content aimed at adults in the app. I also think that this will help lower the churn rate. This turns Disney+ from a babysitting service into a service that offers something for all ages now with a much wider content selection.
The amount of Adult Animation, Holiday classics (Elf is now on Disney+), vast array of reality programming, awards caliber shows and movies, Hulu Originals, tons of added Sci-Fi films as well, etc etc. The main Disney+ library along with the Hulu originals and licensed sdhows and films make this a top notch service now.