What plan do you think Jesse came up with?
I believe he's going to tell Walt jr. about his dad because that would rock Heisenberg to the core.. with everything he did he always made sure that his family is safe and didn't know (Skylar just broke through the ruse).
Taking away Jr. in a kind of way could be devastating to Walter without having to fire any shots because his family is the only thing left he cares about.
I think the clue is what Jesse said, "I'll get him at his other home." That means either the car wash, the school or the lab. I almost wonder if they will revisit Gus' laundry?