The changelist includes: Added support for some additional web client features (e.g. Message info, recent emoji sync), added support for web link previews on outgoing messages, updated organization of phone numbers on the Contact Info screen, message history backup process should now cause fewer issues with normal app functionality, attempted fix for issues connecting via proxy servers and miscellaneous fixes and updates.
The update is available now from BlackBerry World. You can go to the latter's WhatsApp for BlackBerry 10 page by clicking on the sourcelink..
WhatsApp for BlackBerry 10 receives an update
source: WhatsApp via Crackberry