WhatsApp for Windows Phone just got updated to v2.12.266.
The only noticeable change is a new and redesigned emoji UI as you can see from the screenshot below...
However, this latest change isn't new to WhatsApp beta testers as it was rolled out a few days ago to them.
It's nice to know that WhatsApp is still working on refining user experience on their Windows Phone app.
Though we expect to get (and are still waiting for) a new Windows 10 Universal version of the app that runs on both Windows 10 PC and mobile. We will have to wait and see.
In the meantime, you can grab this update from the Windows Phone store right now