Twitter introduced a new design

Twitter today introduced a new version of its interface. The new design will be the same for Twitter.com and for mobile applications. In addition, the TweetDeck application was aligned with it.

On the fly.twitter.com page it is detailed about future changes.
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The new design of Twitter will be available in the coming weeks. You can see it right now in updated versions of mobile.twitter.com and Twitter applications for iPhone and for Android . If you update and enter a new mobile application, then a new design should appear on your computer.

As you know, the last time Twitter radically changed the design a little over a year ago.

via Twitter Blog