Considering that Delta is taking over the lease, it is unlikely this aircraft would be parted out. You have to own an aircraft to break it up into parts. As for when this aircraft would go into revenue service, it would have to be painted first and considering the slack in their current fleet, I would assume that interior mods would be completed beforehand as well. So, my opinion from the sidelines is that this aircraft is headed for temporary storage until DL
can set a schedule for the necessary maintance for this frame and when they would want it in revenue service. There is one unlikely alternative as well, they could keep it as a lone oddball and use it exclusively for charters.