We can use future continuous almost the same was as present continuous to show that something was planned.
1 I'm visiting her next week
2 I will be visiting her next week
The meaning is pretty much identical. What about this sentence?
3 When she comes I will be playing.
Does 3 have two meanings? One when she comes I'm already engaged in playing. Second it's my plan to play for some time after her arrival. What's the answer?