All these new chart features are nice. There are several things that are not ok for me at first sight:
1. Crosshair coordinates should be rendered outside the plot area or their position should be configurable.
2. The follow curve functionality does not work when data in the selected series is in descending order.
3. The title is now rendered higher than earlier. I had to add 25 pixel to my old plot area top padding in order to see the chart's title.