Premeries : get notified about a returning tv show that a user following before 3 days
example :
Good news 
One piece is returning back in 3 days on Fuji TV
you still have time to get some snacks! 
DVD & Blu-ray : get notified when a movie digitally released
Digital release date in different countries is too hard to implement at the moment 
When to notify is a ToDo task available: https://trello.com/c/aVppTlL4/135-when-to-notify-new-episodes
thank you for your answer Chris so i guess we can go only for notifications for premeries tv show beside custom notifications