The rollout seems a bit drawn out, but I'll look at the positive side and just be glad this is finally happening. It's one of the areas where AA has actually be quite ahead of DL with a customer-centric offering.

I'm curious what the cut-off will be for selection? At AA, you can pre-select anywhere from 30 days in advance to 24 hours prior to departure. This allows folks who get complimentary upgrades to select, as long as they are upgraded at least 24 hours in advance of departure.