The Keyword Distribution Graph is located under the keywords section in the Bing Ads Web interface. A drop down allows you to view aggregate keyword performance data in trend graphs or by the keyword distribution graphs as shown below.
The tool is fun, addictive even. Fortunately it’s also practical. Keywords are grouped by performance for multiple metrics, and you can interact with multiple graphs at the same time, drilling into those keyword performance groups.
Use the tool to quickly identify which keywords have great ROI, which ones have exorbitant CPAs, and find the outliers that are skewing your data, along with much, much more. Microsoft has a helpful demo video on their post about the launch, but the tool is intuitive and easy to start diving into.