WhatsApp keeps pushing incremental updates to its Beta apps on all major platforms including Windows Phone. These updates bring new features and changes which finally make their way to stable release version of the app sooner or later. Now the latest WhatsApp Beta for Windows Phone brings changes in the Photo / video attachment UI and it now makes it easier to attach media (check in screenshots).
There is also some improvement in UI of the “quote messages in reply” feature introduced in the last WhatsApp Beta update. The latest version no. is 2.16.94.