Not at all surprising that Lightning Rod is delayed given it has been testing for less than a week at this point. I think there is a possibility it could be ready the following weekend, but I'm guessing first weekend in April is more likely. Just another reminder that if you need to travel a significant distance never make plans until well after an attraction is supposed to open.
Anyway, the ride looks excellent based on that video. While I'm still not sure of my plans for this year, I really hope that I'll be able to make it to Dollywood this summer and give the ride a try.