Are there any plans to update the new Release and Iteration burndown to have an option for Milestones? It would be very helpful to be able to see that style of a burndown for Milestones. We will often have projects that end up spanning multiple releases (quarters) and we use Milestones to track these. Being able to see that burndown (with prediction line) for the entire project would be very helpful.
There are no current plans to update these apps to use Milestones. You may look into the Milestone Burnup App available in the App Catalog and also on github if you wish to modify it further.