I like the legend feature that easily shows the number of feature in the map extent for each feature type. It will be great that the legend can show other statistics info for each feature type, such sum of shape.length for lines and sum of shape.area for polygons. They should be bascially same (all are statistics information you can obtain by "summarize"), however, only count can be shown by default, without customization or coding. In the future other statistics info like total length and total area should be also options to show. It will be a huge plus to create report maps or add summary to the map without having to create a seperate summary table.