WhatsApp has started rolling out voice calling feature to its iOS app. WhatsApp has just pushed the newer version of the app in App store with voice calling feature. This feature came to Android last month.
Company has also confirmed in the changelog that the feature will not be instantly available to all users. It will be rolling out the voice calling feature slowly over the next several weeks. It means it is not necessary that you get the voice calling feature even if you update your app today.
Along with the calling, whatsapp has also added iOS 8 share extension. It means now you can share photos, videos, and links right to WhatsApp from other apps. You can also edit contacts direct from the app. Now WhatsApp also lets users share multiple videos at once. One can also rotate and crop video before sending.
If you are iOS user, you should update your app now and then wait for the voice calling come to you in next few days.
Source: WhatsApp iOS