The app, which will be optimized for El Capitan, will show interaction highlights within the OS X Notification Center, and it has a built-in dark mode for users who prefer a darker interface.
New Twitter for Mac in dark mode looks so good pic.twitter.com/OnDukgtslx— Rus (@rus) October 21, 2015
Twitter for Mac has never been a focal point for Twitter, and the app has often gone for months without updates and new feature additions. From June of 2011 to April of 2013 it received zero updates, and in 2014 and 2015, it's only been updated twice. With the revamped version, it's possible Twitter plans to invest more of its resources into the Mac app to allow it to better compete with third-party products like Tweetbot.
Twitter plans to release its updated Mac app in a few months, with no concrete launch date set at the current time.