^The new shade structure a little before the base of the stairs is surely where the metal detectors will be. The way it seems, both Fast Lane and standby queue will be as usual up until that point, an attendant will then direct you to the lockers if you have anything on you, stuff goes in a locker, then you go back to the metal detectors, scan through, and continue on through the line like usual. Only thing I see being an issue is the backtracking being confusing to some people, though it'll probably naturally iron out over time.
Really wish they would have thought of this an integrated it into the initial plans, instead of having to "fit" it into the existing setup. Could be worse though, the same channel posted a video showing Steel Vengeance's new double-sided locker setup, and it is a certified headache figuring out that.