Facebook always try to introduce some new features to their user through the Facebook app as well as web version. This time they are planning to change user interface by introducing a bottom navigation bar. At this time the features is available only for beta version.
A beta tester Fedor von Bock, who attached a screenshot of the app on his Google+ post. According the screenshot, Facebook app has a navigation bar at the bottom of the screen. It also seems there are two tabs at the navigation bar. The tabs are in German language so Fedor van Bock translates it in English for his friends and followers. He mentions, one is ‘Homepage’ and another is ‘Explore’. Explore tab use to show content from pages similar to those you already liked.
Finally most apps are adding bar on the bottom. Facebook also testing this bar among his beta testers. If the feedback is positive then we can expect the new tab on our app within few months. If you are a beta tester then you can update the app now for this new feature.