While there aren’t many new visible changes, 9to5Mac has discovered that the new build comes with a brand new wallpaper and a new icon for ‘General’ in System Preferences. However, a word of caution to all developers – if you are currently using Xcode, do not update to this build yet as it crashes Xcode. There is no fix yet for the crashes so perhaps wait it out until there is an update to Xcode.
OS X 10.11 El Capitan features performance improvements, optimisations, battery life improvements and new updates such as an enhanced Mission Control, windows snapping, updates to Mail, Safari and a lot more. While Yosemite was not the best of releases in terms of performance and stability right off the bat, El Capitan is already looking like a pretty solid and must have update. Yours truly has been using El Capitan since beta 1 on a 2012 MacBook Air 13 inch model and not been disappointed so far.
The update is available in Mac App Store and also in the Developer Center. If you are not a developer but still interested in living on the bleeding edge, Apple offers a public beta software program through which you can register, download and install El Capitan which is at public beta