Calculation groups are a great new addition to Power BI. Patrick LeBlanc gives you a terrific introduction.
For anyone who is looking for better Application Lifecycle Management (ALM) offerings for PowerApps and Power Platform solutions, this should be very helpful.
In the Power BI Service, you can now block the creation of classic workspaces. Please, please, please do this!
Excel is a great tool for exploring your semantic model (i.e., your Power BI dataset). Now, you can connect directly to a dataset in Power BI Desktop, whereas before you could only connect to a dataset in the Service. Now, you don't have to publish your changes to explore their impact.
Belinda Allen has a new video series out where she is sharing Tiny Tips. If you are new on your Power BI journey, or even if you’re not, give them a watch. She is an incredibly talented instructor. Here, she is giving her tips on formatting the matrix visual in Power BI Desktop.