One of the major problems of WhatsApp for mobile iOS since its own initial version, is the inability to send messages when we are offline, but now it is already possible thanks to the latest update.
There is that recognize that this is an error quite serious that WhatsApp has gone dragging from the home, but only in iOS, since in Android if that is possible send messages out of line.
Now with the new update can send them messages although not have connection, is saved in the device and is sent as soon as is connection of data.
Siri is also updated, it seems that little by little is achieving integration with WhatsApp, which means that soon we will be enjoying your help to send and read messages, as she is discussed on the forums, this new capability could come in the next few weeks.