Twitter’s trying out another way to improve tweet discovery in the app, with a test of a new topics bar above the main tweet timeline, providing a quick link to real-time discussions in the app.
As you can see in this example, posted by user Chloe Korzh (and shared by Matt Navarra), the new topic listings appear in bubble tabs above your main feed, which provides an easy way to tap through and immediately connect to the latest discussions on a given subject.