• Google Drive Backup: You can now back
up your chats and media to Google Drive, so if you lose your phone,
switch or upgrade to a new Android phone, you can easily restore
your chats and media. You can set up backups in Settings > Chats
and Calls > Chat backup.
• Starred messages: Now you can tap and
hold on any message in a chat to star it so you can easily find it
later (works like a bookmark). You can browse starred messages from
the Chats tab > Menu > Starred Messages.