You can now add movies and TV shows to collections to group them together. This is useful to get a list of all films in a specific universe or franchise, for example.
Currently collections can’t be created freely, but you can only chose already existing collections. However, this is something that might change in the future to allow users to create collections themselves.
Furthermore you can also add the sales agent(s) of a movie. A sales agent is an intermediate actor of production companies and distributors.