The feature of picture-in-picture mode has been provided in WhatsApp since 2018. Picture in Picture mode is convenient; When someone sends you a link to a video from YouTube, Instagram, or Facebook, it allows you to play the video in a small floating window inside the chat, so you don’t even have to leave the chat. But now WhatsApp is redesigning this feature.

WhatsApp is redesigning this feature
According to WABetainfo, WhatsApp is testing a new redesign for picture-in-picture mode that adds a new control bar to the video player. The control bar is visible below the video and is expected to have controls like pause/resume button, full-screen button and close button. Earlier these controls were only visible on the video feed. But now it is being redesigned.
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You can see the new picture-in-picture mode design in the screenshot below. In the screenshot you can see that the video is being played in picture-in-picture mode in WhatsApp chat.

The picture-in-picture mode redesign is being rolled out with the latest WhatsApp beta update. The redesign was available on phones running WhatsApp beta version 2.21.22.3. It is not available on the stable version of WhatsApp. If you want to see it, you will need to be on the latest WhatsApp beta version.
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If you are not a beta tester, You can here beta program can sign up for.
Apart from the new picture-in-picture mode, WhatsApp is also working on several other features like allowing you to transcribe voice messages, helping you find local shops and cafes, last seen status from specific contacts facility to hide, and much more.
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WhatsApp is also working on a feature to let you transfer your chats from Android to iOS i.e. iPhone or iPad, but no information has been revealed about it officially yet.
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english summary
WhatsApp is redesigning its picture in picture feature