WhatsApp appears to be working on a companion mode that will allow you to sync chat history between multiple devices after adding multi-device compatibility in a rather limited way.
This might be a well-liked inclusion given that many other third-party messaging apps, including Telegram, currently provide comparable functions. However, it might not be as comprehensive as you would think given the standard WhatsApp or Meta/Facebook design.
WABetaInfo claims that WhatsApp may soon get a buddy mode that would let you connect your account to additional mobile devices. It would be wonderful for those utilizing a work-deployed device and a personal device at the same time because this is a significant improvement above the multi-device mode that is already available.
The companion mode pop-up indication for the WhatsApp beta for Android version 188.8.131.52 update appears to let you know that conversation history is syncing and that this relies on the full migration of chat histories between companion devices to ensure privacy throughout your account.
This effectively means that, if and when this feature is available, logging into your WhatsApp account from each companion device will sync chats, which will then be deleted or transferred to the other handset when moving between devices. It appears difficult and resembles the number migration feature that was discovered last year in certain aspects. In the real world, hopefully, this makes more sense.
It should be noted that this exceeds the existing multi-device mode cap. You may only use one smartphone and three more devices, such as computers, laptops, tablets, and certain smart displays. As it is, the most recent WhatsApp beta releases do not include this companion mode in any way. The very restricted nature of WhatsApp account use could be improved by this feature, which has the potential to be quite popular.