WhatsApp Beta is that WhatsApp version given to WhatsApp users who wish to test new features WhatsApp wants to bring to the official final WhstsApp version that most of us use. Not every feature is guaranteed to make it to the final version but we’ve seen many end up in the official version.
So basically, Beta testers get to try out the new cool features first, like this one.
Anyone can become a tester or WhatsApp Beta user. All you need is follow this link, sign up to be a tester and you’ll be given the WhatsApp Beta App.