Whatsapp may soon bring a new feature which will allow the users to use one account on two phones together. As per the reports, the company is also working on a new feature to the apps stable build soon. The same feature is seen in the beta version of the app.
WhatsApp Users May Soon be Able to Use One Account on Two Phones Simultaneously

Using one account on two phones together feature was in demand by the users in the past. The news of the new feature might soon be launched seen on the tweeter.
WABetaInfo posted a tweet and revealed that the user could use one Whatsapp account on two devices simultaneously. The user will be notified about it because of changes to encryption security code.
Check out the tweet:
Testing 👀
When someone adds a new device in his WhatsApp account, you will be notified because encryption keys change.Available in future for iOS and Android! pic.twitter.com/WqrM6cRHWW
— WABetaInfo (@WABetaInfo) March 24, 2020
However, the official confirmation is not yet out like when it will be available for all the users.