Gmail (the desktop browser version) is getting revamped according to an email sent to users from Google. It includes a fresh design, but not just a new UI. Google also outlined some other features (a few of which you may be familiar with as they are already in the Gmail app).
A Google spokesperson has provided the following statement (emphasis included): “We’re working on some major updates to Gmail (they’re still in draft phase). We need a bit more time to compose ourselves, so can’t share anything yet—archive this for now, and we’ll let you know when it’s time to hit send.”
Google Calendar integration is being added. You can access your calendar directly from the Gmail interface. This will be very handy for some users.
Email snoozing will allow you to dismiss an email to reappear in your inbox at a specified time; useful if you are cleaning your inbox but don’t have time to reply right away.
Smart Replies: You can set up algorithmic replies to be automatically sent to people who email you. (This feature is already in the Gmail app.)
Offline email storage: The new Gmail will support the new web standards for storing information right in your browser, as they are gradually stepping away their Chrome Apps.