Play Store start to show new navigation bar below the main tabs (Apps & Games, Movies, Music, Books), this change start to show to users around the world.
It is simply replace the old buttons with new ones, make them more visual with small icons, the buttons are (Top Charts, Categories, Editors’ Choice, Early Access and Family) with horizontal scrolling.
Left: Current Design, Right: New Design
This is not the first time Google start to test something on its services, in fact is famous by its A/B testing, if there is one thing certain about the company is its inconsistency over a huge number of products. Make It hard to keep track of all these small changes and tweaks.