Actions in progress at a specific time: At midnight tonight, I will be sleeping.
Predicting overlapping actions: He will be waiting for you when your bus arrives.
Polite inquiries: Will you be using the printer for long?
Atmospheric descriptions: When we arrive at the festival, the bands will be playing, people will be dancing and the sun will be setting.
Future Continuous + Rules (ECEnglish)
Future Continuous & Perfect Rules (British Council)
Future continuous 1 (WordWall)
Future continuous 2 (WordWall)
Future continuous 3 (WordWall)