You will get to enjoy all of the new animations and changes to the UI of the popular app. Besides the new UI, WhatsApp's Android users can now make phone calls over the app without having to be called first.
And don't forget that WhatsApp is testing out integration with Facebook. The latter purchased the messaging app for over $21 billion and is now looking at ways to take advantage of the purchase. What is being tested now is a "share" button that is available right now only to Facebook beta testers. Clicking on the button allows Facebook users to share news with WhatsApp subscribers.
Check out some screenshots of the new green-tinged Material Design version of WhatsApp by clicking on the slideshow below.
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source: WhatsApp via AndroidWorld.it (translated)