The Business Insider reports on the hidden features in the new Twitter iPhone and Android apps.
The basis of the TV trends section is that you can chat about your favorite show with other fans but that seems to be about it.
Timeline sort by prominence:
This element of the app is timeline that displays the most prominent trends of the day. Filters factor into this again since it scans your surrounding area and provides insight into nearby events and conversations.
More details in compose page:
When composing a message, it asks for a location to add more depth to searching for local content.