Introduction:

As with all the continuous tenses, use the future continuous to describe an action that is happening at a point in time in the future. (Sometimes it is around another action)
Consider the following: They are going to arrive when they will be doing the presentation.
Consider the following: I was talking. I am talking. I will be talking. (Past, present and future continuous)

Structure:

Subject + will + be + verb + ing (present participle)
Will + subject + be + verb + ing (present participle)?
Subject + will + not (won’t) + be + verb + ing (present participle)
Will + subject + not + be + verb + ing (present participle)

Examples:

I will be seeing the boss when you arrive.
I will not be seeing the boss when you arrive.
I won’t be seeing the boss when you arrive.
Will I be seeing the boss when you arrive?
Won’t I be seeing the boss when you arrive?