I feel like one of those newspaper boys on the streets in those old black-and-white newsreels: "Extra, extra, read all about it!"
Damon, the team lead on the XtraCharts team, informs me that the new hit-testing support works on web charts too. So, if you are using the ASP.NET side of XtraCharts, you will have hit-test events triggered on the diagram, the panes, the series, the data points, the axes, the titles, the labels, the legends, and so on.
Phew.