Completely agree with the video previews - it would also be great to eventually have some basic configs for the discovery center, such as defining the primary asset type / display pattern that is shown for each game, configuring custom lists, choosing how many games are in each list, or choosing to include / exclude certain platforms. I assume this could all come with time when theme developers are able to take the wheel, based on your post above.
But feedback aside, I'm very excited with the direction you all are going here. This is one of the best new features I've seen from Big Box and really unlocks the ability to create a unique couch gaming experience, which has been a goal of mine. The product manager in me is super interested in understanding how you're building the "dynamic" list capabilities, and I feel like there's a ton of potential with what you're doing.