A feature in the test is to hide a user's last seen status from certain contacts.

When someone last opened the app, the last seen feature lets other users know if they checked the app without responding to a message. You can hide your last seen from everyone, but you can't see anyone else's. You can set last seen to your contacts only, but you cannot choose specific people to be aware of it.

Here are the privacy options that are available.

screenshot of whatsapp last seen privacy feature

WhatsApp's current Last Seen privacy feature. Credit: Screenshot: WhatsApp

The new feature will allow you to block certain people from viewing your last seen, and it is currently in a testing phase.