This is the best summary I could come up with:

WhatsApp beta version 2.23.16.19 is rolling out to testers on Android, adding features similar to Telegram and Discord chats, Slack’s Huddles, and even Meta’s own Messenger platform.

Tapping the button immediately launches voice chat, along with its own interface.

When everyone leaves, the session remains active but will automatically end after an hour.

Voice chats in WhatsApp are, like its other messages, end-to-end encrypted by default.

The new WhatsApp voice chat feature may show up on non-beta installations as well since WABetaInfo notes it’s a broader release.

While Meta isn’t early to the party with this feature — Telegram has had voice chat features since 2020 — WhatsApp has the benefit of being one of the most widely used chat apps in the world, with over 2 billion users.

I’m a bot and I’m open source!