The new Google Calendar is designed to be "a helpful assistant", so it creates events automatically using information from your Gmail messages. If you book a flight, buy concert tickets or make a hotel reservation, you'll usually get an email conformation and Google Calendar now creates events by extracting relevant data from your email. The nice thing is that the events are updated if you change your reservations or your flights are delayed and you get email updates.
Google Calendar now offers suggestions when you create events and the suggestions are based on the events you've previously created. "With Assists, Calendar can suggest titles, people and places as you type, as well as adapt to your preferences over time. For example, if you often go running with Peter in Central Park, Calendar can quickly suggest that entire event when you type 'r-u-n.'"
Google uses data from Google Maps and other Google services to make the calendar look better. The new Schedule View "includes photos and maps of the places you're going, cityscapes of travel destinations, and illustrations of everyday events like dinner, drinks and yoga".
The new version of the Google Calendar app for Android requires Android 4.1 or later and it will be available in the coming weeks on Google Play Store. Google also promises to release a Google Calendar app for iOS. Hopefully, Google will also update the desktop version and the mobile web app.