According to WABetaInfo, the company operates a Larger Media Preview for its users.
The blog site that is following progress on WhatsApp has shared a lot of screenshots to show how the difference between old and new chat bubbles. Photos shared by the publisher show that previously, chat bubbles had a standard format. Chat bubbles are longer and that is why they show more details.
It is noteworthy that this feature is designed for both Android and iOS corporate apps. Available as part of WhatsApp beta version for iOS 18.104.22.168 and WhatsApp beta version for Android 22.214.171.124.