We will be upgrading the Insight report on February 15th, 2017.
Going forward, the report will be named Insights and will live above the Segmentation report in your Mixpanel project. Insights will have all the functionality of the current Insight report along with a more robust query builder and visualizer. More help documentation on how to use the Insights report will be available upon launch.
If you have any existing saved Insight reports, they will be saved and migrated over to Insights.