WhatsApp Update Improvements
An update as been submitted to the store for what looks to be the most important update to WhatsApp on WP yet: NO MORE MUSIC API
Since Mango, WhatsApp has been using the audio API in Windows Phone to keep the app alive so it can keep sending notifications. It's probably one of the dumbest things they could have done as no other messaging app did this yet still managed to send notifications. This meant that app is drawing on battery constantly and even broke other apps such as podcasts and music.
There have also been bug fixes for things such as hanging and notifications. New smileys have been added (we all really requested this), large images will now be shown and fast resume has been added (ok, we really did ask for this).
Full details can be found on WPCentral.