A select beta testers of WhatsApp will be able to send and receive pictures and videos with the "view once" option. 

This means that the said media disappears when opened once, which is quite similar to how they work on Instagram, though there they disappear after two times.

Also, like Instagram, WhatsApp will notify the user when the media sent by them is viewed. The option to make it a 'view once' media will appear beside the caption bar.

For now, only beta users can send use this feature while others can only receive such photos and videos but not send.

It is not known when WhatsApp will make this official.