After the Whatsapp was made available free for all users. Now, There are various speculations coming out from all around the web that what is Facebook planning to do with Whatsapp. Some Screenshots on Google plus and Reddit shows the new beta version of the app.
These screenshots shows us that Facebook has embedded code to allow user to an opportunity to share the WhatsApp account information with Facebook, in order to enhance Facebook experience. Moreover there is a security restricted area which says that chats and calls are encrypted end to end, you can also show indicators for secure chats. Do see the source link.
Google+ user from Germany posted these screenshots to show these changes. This may be an internal version. If somebody thinks that these screenshots are fake there is again a user which noticed the server side changes which is shown in the photo above.
If any new information about the Whatsapp changes comes, w will share with you.