Find out more about the changes after the break.
There are two notable new features: a new tool that helps you find the best time for an event or meeting, and a much easier interface for creating reoccurring events. The find a time feature was originally released as a Google Calendar lab but has made its way into the app full-time. It allows you to quickly view friends' or co-workers' schedules to best schedule a meeting time by showing potential conflicts and suggesting a time that works for all attendees.
Google also introduced some behind-the-scenes changes to help Calendar work better within your browser. Schedule on!