When the ItemsSource of a series is replaced with new collection, the labels of the old series are not cleared.

Fixed in LIB version: 2014.2.714

Available in 2014 Q3 release.

In a chart that displays more than one series, it would great to be able to turn on/off the trackball feature on a per-series basis. (Currently, suppressing the display of data for a given series doesn't prevent the trackball from snapping to points on that series - a weird experience for the user.

When the LabelTemplate property of the chart's axis is changed at runtime the labels are not resized and they overlap the plot area if they are too long.

Fixed in 2014.2.0630 LIB

Expose RadFunnelChart and RadFunnelSeries for displaying funnel-like segments. They are usually used for visualizing stages in sales / marketing processes. 

Available in R3 2017 Official Release Version.
Check what's new in R3 2017 here: 
http://www.telerik.com/support/whats-new/wpf/release-history/ui-for-wpf-r3-2017

Will be available in Q1 2015 Release.

NullReferenceException on updating data when mouse is over chart's area and trackballinfo is visible. 

To workaround this, remove the TrackBallBehavior when data is updated and add it again on MouseMove.

Offset appears when chart with no margins and paddings is exported.

All labels of the LogratihmicAxis display 'zero' in scenarios with small values  (for example: 0.000000000116 or 2.3E-10)

CategoricalSeriesDescriptor.TypePath is not currently bindable. This means this has to point to a property on your DataSource that returns Telerik series types. This breaks the MVVM design model, as the DataSource points to the ViewModel, that should not contain any View specific types. Please provide a bindable alternative, such that a Converter can be applied to supply the View specific types.

Will be available in Q1 2016 Release.

Incorrect drawing of BarSeries with negative values and additional axis.

This happens when we have one series with only positive values and one with mixed values.

Introduce Annotations ItemsSource property

Available in Release Version Q1 2016.

Bar series with DateTimeContinuousAxis axis with no MajorStep specified. When you zoom the bars gets to big and does not stay within its tick boundaries.

Add RangeSeriesDescriptor

Add support for 3D Surface Series Type.

This feature is now available as part of the ChartView control since R3 2016 Official release. Refer to the link below for more information.
http://docs.telerik.com/devtools/wpf/controls/radchartview3d/series/surfaceseries3d.html

DateTimeContinuousAxis produces too many labels when zoom in to the max and then zoomed out with double clicking the slider. The result is different when zooming out while dragging the slider and when double clicking it.