Leaked screenshots of the new feature were posted on a German website, which claimed the screenshots belonged to an unreleased version of the Whatsapp application for iOS.
According to the website, the screenshots are from version 220.127.116.11 of the app, which is currently being tested internally.
Although no official confirmation has yet been received of the new feature, there is much speculation of the new feature being released in the next update. Once activated, it may be a replacement for existing video calling software such as Skype.
The new update is reported to bring with it the option for multiple chat tabs, enabling users to switch between conversations without having to return to the actual chat list.
Facebook had bought WhatsApp for $22 billion last year after which the messaging app has continued to grow, with the addition of many new features. The app now has over 900 million monthly active users. Source