Here are a few basics:
Future Continuous (will be doing):
Like the past continuous, the future continuous can be used to talk about an activity that is interrupted by another, usually shorter, action:
- I will be sleeping when you arrive.
The future continuous is also used to talk about a future plan that involves a typical or standard sort of activity. For example:
- HP will be launching its latest laptop next month.
As usual, there are certain verbs that tend not to be used in any continuous tense. For example, I would not expect anyone to say "I will be being there when you arrive."
Future simple (will do):
The future simple can be used to make a prediction (i.e. not 100% sure), to make a promise, to talk about willingness to do something, to make a spontaneous decision to do something (which probably happens quite often on the telephone at work when you agree to do something that someone has just requested you do).
- We will probably have less snow next winter than we had this past winter.
- Darling, I will never cheat on you.
- OK, I'll send a copy of that report over to you right away.