The biggest thing you’ll notice from this new version of Google Calendar is the total visual overhaul. This new design is entirely minimal, replacing grids and hard lines with blocks of flat color everywhere in order to offer a cleaner, softer UI with very simple mechanics. Using the app is just as pleasing as looking at it, with visual flourishes that couldn’t be captured in screenshots.
Flat UI seems to be what everyone is doing now, like iOS 7. Now it seems like Google is testing a new flat UI for Google Calendar too. The new version is codenamed Timely, as the same name as on the app Google bought a while ago. Looks very interesting. This could be what Google Calendar needs.