If you are using MDR and are prompted to update go ahead and update. The interface is slightly different it will say Add Presentation and Windows users will select Capture Video and all will look as usual. macOS Catalina users will need to download the new App Mosaic, which is a streamlined version of MDR.
You can also now upload directly YouTube videos into your collection of recordings, keep everything in one place.
Other features are updated quizzes and uploads.
Another feature that can be found in My Mediasite is the new Moderation App which will allow presenters or instructors to moderate not only the Q&A but also the Comments and Annotations on a video within a Channel.