Horizon is where the makers of WordPress.com test upcoming changes and new features with the WordPress.com community.
By using Horizon, you will be testing small and big changes still under development. Not every new feature will be tested here. The Horizon testing site and the Horizon Feedback blog will be a place where the community and makers of WordPress.com can come together and talk about upcoming changes.
Be careful: things might break! If you use this testing site and volunteer to report your findings, it will help us, you, and millions of people worldwide.
We are continually blown away by how smart, creative, and insightful people are who use WordPress.com. Watch for the next testing post to come up… and please join us in testing!