Google Play Store gets updated Google Search bar
Similar to the Now page on the Google Now launcher, the search bar disappears when you scroll down and reappears when you scroll up. The hamburger icon remains on top. Clicking on it allows you access to the navigation menu. Tapping on the actual search bar will show you a list of your past searches.
The update makes Search stand out much more on the Google Play Store. You can get an idea of how it will look from the two GIFs we've embedded below.
source: +KirillGrouchnikov via GSMArena