WABetainfo tweeted about this new feature on their twitter handle.
Right now it doesn’t matter how many devices the user have as he can only use its Whatsapp account only in a single device but this feature will resolve this problem and the user will be able to use his Whatsapp account on 4 devices at the same time. With this feature whenever the user will log in in new device chat history will automatically sync
without any problem.
RightNow this feature is under development and it’s taking some time to log in to any new device but soon we will see this new update in the upcoming future.