According to WABetaInfo, WhatsApp will soon get bigger link previews. This feature is already available in the Telegram app which offers large thumbnails and text.
The website has revealed the feature, though it is a minor change, it will prove to be helpful. Currently, WhatsApp users are able to previews squished into four or five lines with a tiny thumbnail
Telegram on the other hand displays more text and larger images, this gives the users a better idea or preview of what to expect before users open the link.
WABetaInfo tweeted the WhatsApp preview on Twitter for the iOS version, today they also revealed the WhatsApp preview for Android
Currently, the feature is under development and will soon be available for users.