WhatsApp working on yet another ephemeral feature on iOS - 9to5Mac

1. WhatsApp working on yet another ephemeral feature on iOS  9to5Mac
2. WhatsApp Working on View-Once Text Messages for iPhone  MacRumors
3. WhatsApp is testing scheduled messages for chats and groups  Deccan Herald
4. WhatsApp to introduce long-awaited message scheduling feature  Minute Mirror
5. WhatsApp Is Testing Read-Once Disappearing Messages  Engadget