Facebook makes major interface changes fairly frequently. I'm not adverse to change, but I'd like to know what's changing and why. Is there an public, up-to-date Facebook changelog?
You can find them in their blog - https://developers.facebook.com/blog . As usual they post list of issues\changes that were released
And also there is a roadmap for future changes, that can be found here - https://developers.facebook.com/roadmap/