Glad you liked the arc, 'I Dream of Technicolor' Tom.
Sorry to say, I'm not going to be able to give you answers you'll like.
When and why did Jeanie and Neil go back to 1969, and what did they do there?
Oh, there's a plan there. Jean and Neil didn't appear just cause I was bored. That being said, I'm hoping to do something REALLY special that will hark back to that point. I can't tell you what, because the plan is still in the works.
Does Ms. Eden now know what happened to her old master, and that Jeannie is using her old bottle?
I will answer this one. "Does Ms Eden know what happened to Andy?" Of course. They were neighbors and friends. Does Ms. Eden ever learn that Andy was her long lost master. That will be left unanswered.
Is Jeannie the current genie in Rouyaa's old Bottle? Well, that is a strong possibility.