Apple has seeded the 2nd beta of OS X El Capitan 10.11.1 to registered developers. In the previous beta, the company released new emojis in the OS including a taco, burrito, cheese wedge, hot dog, middle finger, and unicorn head, alongside support for Unicode 8.
As of now, there are no notable changes made to the OS in the latest build. Apple did say in the release notes that stability, compatibility, and security improvements are featured throughout the build.
You can download the beta through the Apple developer center if you’re a registered developer.