This new update lets you see your frequent chats, individual chats including the no. of texts, media content, GIF’s, etc.
For frequent users, this feature allows you to quickly select the contact whom you text most. The most practical way this feature might be used is in determining which chats occupy most storage so you can delete them to reclaim space.
This feature might get released for mainstream users in upcoming months.
Stay tuned for more.
Source: MS Poweruser