Well we all have heard about the Material UI which came with Android Lollipop or Android 5.0. All the apps since are trying to get that Material UI in their apps to match the overall accent in the devices they run. And now WhatsApp, one of the popular instant messaging service is also following that trend and getting the Material look.
An experimental build of this changed UI app is there to download directly from the messenger’s official website. All this comes under WhatsApp build 2.12.38 version. There are changes in many parts of the UI like in the conversation page and attachments with new icons,animations, and new emoji tray. You can try all this by going to official website of WhatsApp or you can directly go there from the link below in the source to get the apk.