The goal of this new feature was to allow the admin to easily assign images and video they had already uploaded into the newsroom via the Video and Image tools to their press release and have them packaged nicely to the left of the article. This not only makes it very easy for a journalist to view any images and video that may support your press release, but it also keeps the display in a consistent format...which makes everyone look good ;) winner winner chicken dinner!
How It Works
It looks something like this on the press release tool:
When you click the "Add/Remove Media Items" link, a popup will appear that looks something like the following screenshot. You are presented with a list of all images and video currently in your newsroom media library. From here you can easily hand pick certain ones that should be included in the gallery of your release. There are additional filters on this popup to narrow the list down should your newsroom's library size begin to compare to your daughter's best friend's facebook page.
This eliminates the need to add media into your article body via the content editor (I can see you smiling from here.)