Hi Sam,
Thanks for the links! I've been working with the SelectionManager in the new API, but it's not yet at parity with the functionality of IInteractiveBehavior or IInteractivityService.
I'm working on creating a custom slicer. I've looked at the source code for the slicer visual itself (this source code uses the old API), and it makes extensive use of both classes (IInteractiveBehavior or IInteractivityService), in particular, a function called persistFilter(...).
I'm also curious to know more details about the features outlined in the RoadMap - there aren't any dates or scheudles as to when we can expect new features to roll out, apart from the ones that are now code complete. The documentation seems incomplete.