A new El Capitan beta is out.
Other than bug fixes and performance enhancements, OS X 10.11.4 also adds a couple of new features. The Notes app adds supports password-protected entries. Live Photos can now be viewed in Messages. Other than those two additions though, the update mostly contains under-the-hood improvements.
Apple’s release notes for the update asks developers to focus on iBooks and Photos. There’s no hints of new features, but we’ll let you know what new stuff we find once we get the new El Capitan installed.