If your one of the million+ Whatsapp users, you probably downloaded an update for it yesterday. One of the major changes being introduced for IOS users is the pricing model already in place for Android, Blackberry and Windows Phone users : The first year is free and it costs $0.99 per year thereafter.
Other changes the latest update brings are:
- Multi-send User Interface - send multiple photos at the same time
- URL Schema - allows third party apps (even on IOS) to hook into WhatsApp
- iCloud backup of messages
The good news for all current iPhone users is that WhatsApp will be free of charge for the rest of your life. - WhatsApp blog