There are all the latest changes found in Windows 10 builds 18277 and 18272

[Windows Central]

Check out the new features and changes shipping with Windows 10 build 18277 and build 18272.
Microsoft recently made available Windows 10 build 18277 for PCs enrolled in the Fast ring for testers. This is the twelfth preview releasing for the 19H1 development, and even though it's still considered a minor update, it introduces a new set of features and improvements.
Windows 10 build 18277 introduces a new option to control brightness in Action Center, improves Focus assist, ships with a beta version of emoji 12, and much more.

Full story from the WindowsCentral blog...