1.WhatsApp group admins can now choose toallow only admins to send messages to a group and you can easily notify people when you change your phone number.
2. Admin controls: In group settings, there's now a control that allows admins to restrict who can change the group's subject, icon, and description.
To enable the latest setting, open “Group Info,” tap Group Settings > Send Messages and select “Only Admins.”
New features from WhatsApp messenger