This new feature is called Highlights and it basically shows the user at a glance the information that the sender believes is important. For example if you have an upcoming flight, airline companies who send out the email will be able to make it so that the “Check in” action is available at a glance, as well as the live flight status information.
This saves users from having to open the whole email to scan for flight times or look for links on the internet if they wish to check-in online. This can also be applied to hotel reservations, purchases, tickets that you have bought for events, and so on. Sounds pretty good, right? For end users, hopefully more developers will take advantage of this feature for the future.
Google’s Inbox was launched last week and as it stands, it is only open to those who have received an invite. Users can request for invites by emailing inbox@google.com, or alternatively they can get a friend who has already been invited to send them an invite. Google is also sending out invites on a more frequent basis now, so hopefully you should get yours soon!