I like the new ribbon layout and design, it is much more in Office365 look-and-feel.
But I also really miss a Quick Access Toolbar, would be nice if this can be added in the future.
An other thing I mentioned is that the Get Data button is now one button, instead of a splitted button. A splitted button (like the Transform Data button) would be nice, where the top part opens the Get Data dialog and the bottom part opens the dropdown menu.
@edhansThanks for the feedback! In reference to #7, it seem like you have both a visual on the canvas selected and a measure in your fields list selected. Selecting a visual will get the Format and Data/Drill tabs to show up. Selecting a Measure will get the Table tools and Measure tools tabs to show up.
To switch to a Simplified Ribbon there is a small shevron in the bootom right corner of the Ribbon.
Based on the usage telemetry of the Quick Access Toolbar we do not plan to implement it at this point. Creating a seprate Idea and voting for it would help us understnad the demand. We do plan to add the Save button in the Title.
Power Query Edito will be switching to the new ribbon next year but no exact timeframe yet.