WhatsApp has specifically mentioned in the notification that it is not changing the privacy of your personal conversations. The update would make it easier for businesses to chat using Facebook tools. The company says that the chats with these businesses are optional and that is labeled in the app. The messaging app has also reassured in the reminder that WhatsApp cannot read the private conversations of users because they are end-to-end encrypted. And they would remain that way even after the new update is rolled out.