WhatsApp for BlackBerry 10 gets an update to version 2.11.134.2, this update includes larger photo thumbnails, account management features such as the ability to change number and delete account, bug fixes in this build as well.
There has been some heavy competition in the WhatsApp vs. BBM category this week, see WhatsApp calling out BlackBerry, BlackBerry responding.
Competition is always good, so are choices. If you wish to get the latest update of WhatsApp head on over to BlackBerry World.