After Google Search and Google Maps, it's time for Google Calendar to toggle to a Google+ interface. The new design is a lot cleaner, even if no significant feature was removed. "Quick add" is now obtainable if you click the arrow next to the "Create button" (not very intuitive), "Print" and "Refresh" are now buttons instead of links, the month view below the "Create" button can be distorted, "Save" and "Discard" buttons are only displayed at the top of the page.
"Right now, the changes are just aesthetic and have not affected the way Calendar works. You can choose to turn off the new look by clicking the gear icon and choosing Use the classic look (you can turn it back on by going to the gear icon and choosing Try the new look)," explains Google. Perceptibly, at some point, Google Calendar will put together with Google+ and we'll see even more changes.