Only yesterday was released a new update of Whatsapp aimed at restoring the functioning of backup using iCloud, but please note that it is working on the Beta version and are continuing in the new build released a few minutes ago, has been added for compatibility with iPhone 6 and iPhone 6 Plus.
That is to say that the application now has been redefined, using the new XCode. In short, then we can chat with our friends without seeing the screen zoomed and enlarged, but in full definition, using all the pixel Retina HD screens of the new Apple devices.
In the last beta version of Whatsapp, however, still lacks the implementation of QuickReply by push notifications, can only work on iOS 8 and above.