Android: If you're tired of switching between your accounts just to see all your new email, Gmail has finally added a unified inbox view that shows all your messages, from all accounts, in one place.
The "All Inboxes" view combines email from all your accounts, including IMAP accounts for other services (like Yahoo or Outlook). Those non-Gmail accounts also get threaded conversations, just like Gmail, which is a nice touch.
This update also sports better autocomplete in search, more responsible animations, and a button to save attachments to Drive. We're not seeing it in Google Play yet -- as with many Google updates, it's likely rolling out to all users slowly.
All Your Mail, Together in One Place [Official Gmail Blog]